Quick Definition
full of astonishment, amazed
Strong's Definition
utterly astounded
Derivation: from G1537 (ἐκ) and G2285 (θάμβος);
KJV Usage: greatly wondering
Thayer's Greek Lexicon
ἔκθαμβος, ἔκθαμβον (θάμβος, cf. ἔκφοβος), quite astonished, amazed: Act_3:11. (Polybius 20, 10, 9. Ecclesiastical and Byzantine writings; terrifying, dreadful, Dan_12:7 Theod..)
STRONGS NT 1569a: ἐκθαυμάζωἐκθαυμάζω: (imperfect ἐξεθαύμαζον); to wonder or marvel greatly (see ἐκ, VI. 6): ἐπί τίνι, at one, Mar_12:17 T WH. (Sir_27:23 Sir_43:18; Dionysius Halicarnassus, Longinus, others.)
Mounce Concise Greek Dictionary
ἐκθαυμάζω ekthaumazō 1x
to wonder at, wonder greatly, Mar_12:17
Abbott-Smith Greek Lexicon
**† ἔκ -θαμβος , -ον
( < θάμβος ),
[in LXX : Wis_10:19 , Da TH Dan_7:7 ( dreadful, terrible: H574 ) * ;]
amazed ( cf. Polyb ., xx, 10, 9): Act_3:11 .†
Moulton & Milligan — Vocabulary of the Greek NT
ἔκθαμβος [page 194]
For this rare adj. ( Act_3:11 ) which hitherto has been attested in profane Greek only from Polybius (xx. 10. 9), we may cite the imprecatory tablet of iii/A.D. discovered in the necropolis of Hadrumetum, Wόnsch AF 5 .20 καὶ οἱ δαίμονες ἐξεγερθῶσιν ἔκθαμβοι καὶ περίφοβοι [γ ]ενόμενοι .
Liddell-Scott — Intermediate Greek Lexicon
ἔκθαμβος ἔκ-θαμβος, ον "amazed, astounded", NTest.
STEPBible — Tyndale Abridged Greek Lexicon
ἔκ-θαμβος, -ον
(θάμβος), [in LXX: Wis.10:19, Da TH Dan.7:7 (dreadful, terrible: אֵמְתָּנִי) * ;]
amazed (cf. Polyb., xx, 10, 9): Act.3:11.†
(AS)