Fool (foolish, foolishness) (3474) (moros) conveys the root meaning of one who is mentally dull, sluggish in understanding, foolish, morally worthless, useless, silly or stupid (English = “moron”). Absurd (ridiculously unreasonable, unsound, or incongruous) Compare the derivative moria = Folly, foolishness, absurdity (1Cor. 1:18, 21, 23; 2:14; 3:19). There are a number of synonyms including blockhead, bonehead, dimwit, dork, numbskull, and the list goes on and on. Jesus seems to characterize calling someone a fool as a more serious reproach than a "good for nothing". MacArthur - Moros (foolish) has the root meaning of being mentally dull, silly, or stupid, and is the word from which we get “?moron.?” Webster on fool, foolish - lacking in sense, judgment, or discretion. Foolish implies the character of being or seeming unable to use judgment, discretion, or good sense. Unwise; imprudent; acting without judgment or discretion in particular things. Vine - Moros primarily denotes "dull, sluggish" (from a root muh---, "to be silly"); hence, "stupid, foolish;" it is used (a) of persons, Matthew 5:22 , "Thou fool;" here the word means morally worthless, a scoundrel, a more serious reproach than "Raca;" the latter scorns a man's mind and calls him stupid; moros scorns his heart and character; hence the Lord's more severe condemnation; in Matthew 7:26 , "a foolish man;" Matthew 23:17,19 , "fools;" Matthew 25:2,3,8 , "foolish;" in 1 Corinthians 3:18 , "a fool;" the Apostle Paul uses it of himself and his fellow-workers, in 1 Corinthians 4:10 , "fools" (i.e., in the eyes of opponents); (b) of things, 2 Timothy 2:23 , "foolish and ignorant questionings;" so Titus 3:9; in 1 Corinthians 1:25 , "the foolishness of God," not moria, "foolishness" as a personal quality (see C, No. 1), but adjectivally, that which is considered by the ignorant as a "foolish" policy or mode of dealing, lit., "the foolish (thing);" so in ver. 1 Corinthians 1:27 , "the foolish (things) of the world." (Fool, Foolish, Foolishly, Foolishness - Vine's Expository Dictionary of NT Words) Barclay - Moros also means fool, but the man who is moros is the man who is a moral fool. He is the man who is playing the fool....To call a man moros was not to criticise his mental ability; it was to cast aspersions on his moral character; it was to take his name and reputation from him, and to brand him as a loose-living and immoral person. (Matthew 5 - William Barclay's Daily Study Bible) Ellicott - Jesus "Himself used the word of the scribes and Pharisees (Mt 23:17; 23:19), and Paul of the skeptical Greek materialist (1Cor 15:36). The self-same word might spring from a righteous indignation or from malignant hatred." (Ellicott) Expositor's Greek Testament - The word moros "expresses a more serious form of contempt than Raca. Raca expresses contempt for a man’s head = you stupid! More expresses contempt for his heart and character = you scoundrel. The reckless use of such opprobrious epithets Jesus regarded as the supreme offence against the law of humanity. (Matthew 5 - The Expositor's Greek Testament) Friberg - Moros - foolish, stupid always a term of reproach; (1) of persons considered to be intellectually weak, irrational, or lacking in foresight (Mt 7.26), opposite sophros (wise) and phronimos (intelligent); substantivally = foolish person (Mt 25.3); of one without respect for God (Mt 23.17); the meaning of the substantive more, in Mt 5.22 is uncertain; as an insult it could mean you fool! blockhead!; (2) of things foolish, useless (2Ti 2.23); neuter as a substantive ta. mora, what is thought of as foolish (1Cor 1.27) MacArthur notes that moros "was sometimes used in secular Greek literature of an obstinate, godless person. It was also possibly related to the Hebrew marâ which means “?to rebel against.?” To call someone You fool was to accuse them of being both stupid and godless. The three illustrations in this verse show increasing degrees of seriousness. To be angry is the basic evil behind murder; to slander a person with a term such as Raca is even more serious, because it gives expression to that anger; and to condemn a person’s character by calling him a fool is more slanderous still...Jesus’ prohibition is against slanderously calling a person a fool out of anger and hatred. Such an expression of malicious animosity is tantamount to murder and makes us guilty enough to go into the fiery hell. (MacArthur, J: Matthew 1-7 Macarthur New Testament Commentary Chicago: Moody Press) The Septuagint uses moros twice in a passage that gives us a "descriptive definition" of moros - Isaiah 32:5 No longer will the fool (moros) be called noble, Or the rogue be spoken of as generous. 6 For a fool (moros) speaks nonsense, And his heart inclines toward wickedness: To practice ungodliness and to speak error against the LORD, To keep the hungry person unsatisfied And to withhold drink from the thirsty. Moros - 12x in 12v - NAS renders moros as fool(1), foolish(7), foolish things(1), foolishness(1), fools(2). Matthew 5:22 "But I say to you that everyone who is angry with his brother shall be guilty before the court; and whoever says to his brother, 'You good-for-nothing,' (Raca) shall be guilty before the supreme court; and whoever says, 'You fool,' shall be guilty enough to go into the fiery hell. A. B. Bruce: "Raca expresses contempt for a mans head-you stupid! Moros expresses contempt for his heart and character-you scoundrel" Matthew 7:26 "Everyone who hears these words of Mine and does not act on them, will be like a foolish man who built his house on the sand. Comment - A fool hears truth and does not obey. Zodhiates - In Matthew 7:24, our Lord illustrates a sensible man as one who does not build on shifting sand but on solid rock. It is much easier to build on sand, but it certainly is not permanent. The person who thinks only of the present and does not consider the eternal is a fool....Moros, someone who acts thoughtlessly or contrary to reason. (1 Corinthians Commentary) Matthew 23:17 "You fools and blind men! Which is more important, the gold or the temple that sanctified the gold? Zodhiates - Though in modern Greek the word morós is used for "baby," the New Testament consistently attaches the term to adults who willfully (i.e., consciously) and irresponsibly ignore God's commands. Christ's address to the scribes and Pharisees, for example, "Ye fools [moroà from morós] and blind" (Mt. 23:17, 19), is a condemnation of their rebellion, not pity toward their immaturity. Adults know that what they are doing is wrong but do it anyway. (Exegetical Commentary on Matthew) Matthew 25:2 "Five of them (virgins) were foolish, and five were prudent. 3 "For when the foolish took their lamps, they took no oil with them, 8 "The foolish said to the prudent, 'Give us some of your oil, for our lamps are going out.' Zodhiates - In our Lord's parable of the ten virgins, we are told that five of them were sensible or prudent (phrónimoi) and five were foolish (moraÃ, the feminine plural form of morós [Mt 25:1-13]). The sensible ones thought of the future and considered the need to take oil in their vessels. The foolish ones, however, thought only of the present. Thus a fool can be characterized as one who thinks only of the present time without any consideration of the future. (1 Corinthians Commentary) 1 Corinthians 1:25 Because the foolishness of God is wiser than men, and the weakness of God is stronger than men. 27 but God has chosen the foolish things of the world to shame the wise, and God has chosen the weak things of the world to shame the things which are strong, 1 Corinthians 3:18 Let no man deceive himself. If any man among you thinks that he is wise in this age, he must become foolish, so that he may become wise. MacArthur - Human wisdom is moronic in the Lord’s sight. Mounce - Paul uses moros to describe the distance that exists between the world’s wisdom and God’s. The difference is so great that “God’s foolishness” (if he were foolish, which he is not) is wiser than human wisdom (which is not wise) (1 Cor. 1:25); this is by God’s design (1Cor 1:27). In fact, the distance is so great that the wisdom of God as seen in the cross is foolishness (the related noun moria) to the unbelieving world but the power of God to those who are being saved (1Cor 1:18). Indeed, the non-disciple can’t even understand the spiritual things of God (1Cor 2:14) because they are folly (moria) to him. Consequently, true disciples must become “fools” in the eyes of the world so they can be truly wise (1Cor 3:18). (Mounce’s Complete Expository Dictionary of Old & New Testament Words) 1 Corinthians 4:10 We are fools for Christ's sake, but you are prudent in Christ; we are weak, but you are strong; you are distinguished, but we are without honor. 2 Timothy 2:23 But refuse foolish and ignorant speculations, knowing that they produce quarrels. Titus 3:9 But avoid foolish controversies and genealogies and strife and disputes about the Law, for they are unprofitable and worthless. Moros - 7v in the Septuagint - Deut 32:6; Job 16:7; Ps 94:8; Isa 19:11; 32:5f; Jer 5:21 Deuteronomy 32:6 "Do you thus repay the LORD, O foolish and unwise people? Is not He your Father who has bought you? He has made you and established you. Psalm 94:8 Pay heed, you senseless among the people; And when will you understand, stupid ones? Jeremiah 5:21 'Now hear this, O foolish and senseless people, Who have eyes but do not see; Who have ears but do not hear.