Quick Definition
cowardly, timid
Strong's Definition
timid, i.e. (by implication) faithless
Derivation: from (dread);
KJV Usage: fearful
Thayer's Greek Lexicon
δειλός, δείλη, δειλόν (δείδω to fear), timid, fearful: Mat_8:28; Mar_4:40; in Rev_21:8 of Christians who through cowardice give way under persecutions and apostatize. (From Homer down.)
Mounce Concise Greek Dictionary
δειλός deilos 3x
timid, fearful, cowardly, Mat_8:26 ; Mar_4:40 ; Rev_21:8
Abbott-Smith Greek Lexicon
δειλός , -ή , όν
( < δέος ),
[in LXX for H7390 , etc.;]
cowardly, fearful: Mat_8:26 , Mar_4:40 , Rev_21:8 .†
Moulton & Milligan — Vocabulary of the Greek NT
δειλός [page 138]
For the neut. plur. used adverbially, see P Iand 11 .4 (iii/A.D.) ὀχλεῖ μοι δῖλα ὁ Τρωίλος . MGr δειλός = timid, shy.
Liddell-Scott — Intermediate Greek Lexicon
δειλός [Etym: δέος] of persons, "cowardly, craven", Il. ; hence, "vile, worthless", id=Il. :— δειλός τινος "afraid of . ." , Anth. "miserable, luckless, wretched", Hom. ; with a compassionate sense, like Lat. miser, δειλοὶ βροτοί "poor" mortals! ἆ δειλέ "poor wretch!" ἆ δειλοί "poor wretches!" id=Hom. of things, "miserable, wretched", Hes. , Soph.
STEPBible — Tyndale Abridged Greek Lexicon
δειλός, -ή, όν
(δέος), [in LXX for רַךְ, etc. ;]
cowardly, fearful: Mat.8:26, Mrk.4:40, Rev.21:8.†
(AS)