Quick Definition
I am in trouble, doubt, difficulty
Strong's Definition
to be thoroughly nonplussed
Derivation: from G1223 (διά) and G639 (ἀπορέω);
KJV Usage: (be in) doubt, be (much) perplexed
Thayer's Greek Lexicon
διαπορέω: διαπόρω imperfect διηπόρουν; middle (present infinitive διαπορεῖσθαι (Luk_24:4 R G)); imperfect διηπορουμην (Act_2:12 T Tr WH); in the Greek Bible only in (Dan_2:3 Symm. and) Luke; properly, thoroughly (δ῾ιἀαπορέω (which see), to be entirely at a loss, to be in perplexity: absolutely Act_2:12; followed by διά τό with an infinitive Luk_9:7; περί τίνος, Luk_24:4 (here the middle is to be at a loss with oneself, for which L T Tr WH read the simple ἀπορεῖσθαι); Act_5:24; ἐν ἑαυτῷ followed by indirect discourse, Act_10:17. (Plato, Aristotle, Polybius, Diodorus, Philo, Plutarch, others.)
Mounce Concise Greek Dictionary
διαπορέω diaporeō 4x
to be utterly at a loss; to be in doubt and perplexity, Luk_9:7 ; Act_2:12 ; Act_5:24 ; Act_10:17
Abbott-Smith Greek Lexicon
** δι -απορέω , -ῶ ,
[in Sm .: Psa_77:5 , Dan_2:1 * ;]
to be quite at a loss, be in great perplexity: absol. , Act_2:12 ; seq . διὰ τό , c . inf ., Luk_9:7 ; περί , Act_5:24 ; ἐν ἑαυτῷ , Act_10:17 .†
Liddell-Scott — Intermediate Greek Lexicon
διαπορέω fut. ήσω "to be quite at a loss", Plat. :—so in Mid., with aor. and perf. pass., id=Plat. "to raise an ἀπορία", "start a difficulty", Arist. :—so in Mid., Plat. : —Pass. "to be matter of doubt or question", id=Plat. , Arist.
STEPBible — Tyndale Abridged Greek Lexicon
δι-απορέω, -ῶ
[in Sm.: Psa.77:5, Dan.2:1 * ;]
to be quite at a loss, be in great perplexity: absol., Act.2:12; before διὰ τό, with inf., Luk.9:7; περί, Act.5:24; ἐν ἑαυτῷ, Act.10:17.†
(AS)