Quick Definition
ἰσχυρός, ά, όν Adj strong, mighty, powerful
Strong's Definition
from 2479; forcible (literally or figuratively)
KJV Usage: boisterous, mighty(-ier), powerful, strong(-er, man), valiant
UBS Dictionary of the Greek New Testament
adjc. | -ά, -όν | ἰσχύω
76.11 · Power, Force
powerful, strong pertaining to having power
1CO 1:25 · 1CO 1:27 · 1CO 10:22 · 2CO 10:10 · HEB 11:34 · REV 5:2 · REV 10:1 · REV 18:10 · REV 18:21 · REV 19:18
79.63 · Features of Objects · Strong, Weak
strong, vigorous pertaining to being physically strong and vigorous
MAT 12:29 · MAT 12:29 · MAT 14:30 · MRK 3:27 · MRK 3:27 · LUK 11:21 · LUK 11:22 · 1CO 4:10 · HEB 11:34 · 1JN 2:14
78.16 · Degree · Much, Little [Positive-Negative Degree]
great, greatly, intense, severe a high point on a scale of extent and with the implication of strength involved in the activity or state
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἰσχυρός, -d, -όν, (ἰσχύω). [fr. Aeschyl. down], Sept. mostly for ON, Wj, PIN, DD, and Chald. PPA; strong, mighty; a. of living beings: strong either in body or in mind, Mt. xii. 29; Mk. iii. 27; Lk. xi. 21 sy.; Rev.v. 2; x. 1; xviii. 21; ἐν πολέμῳ, mighty i.e. valiant, Heb. xi. 34, ef. Rey. xix. 18; of one who has strength of soul to sustain the assaults of Satan, 1 Jn. ii. 14; univ. strong, and therefore exhibiting many excellences, 1 Co. iv. 10 (opp. to ἀσθενής); compar., Mt. iii. 11; Mk.i. 7; Lk. iii. 16; mighty, —of God, 1 Co. i. 25; Rev. xviii. 8, (Deut. x. 17; 2 Mace. i. 24, ete.) ; of Christ raised to the right hand of God, 1 Co. x. 22; of those who wield great influence among men by their rank, authority, riches, ete., τὰ ἰσχυρά i.q. τοὺς ἰσχυρούς (on the neut. cf. W. § 27,5), 1 Co. i. 27 (οἱ ἰσχυροὶ τῆς γῆς, 2 K. xxiv. 15); joined with πλούσιοι, Rey. vi. 15 (Ree. of δυνατοί). b. of inanimate things : strong i. q. violent, ἄνεμος, Mt. xiv. 30 [T WH om. icy.]; forcibly uttered, φωνή, Rev. xviii. 2 [Rec. μεγάλη) (Ex. xix. 19); κραυγή. Heb. v. 7; βρονταί, Rev. xix. 6; λιμός, great, Lk. xv. 14; ἐπιστολαί (stern, [forcible]), 2 Co. x. 10; strong i. q. firm, sure, παράκλησις, Heb. vi. 18; fitted to withstand a forcible assault, πόλιες, well fortified, Rev. xviii. 10 (τεῖχος, 1 Mace. i.33; Xen. Cyr. 7, 5, 7; πύργος, Judg. ix. 51). [Cf. δύναμις. fin.]
Mounce Concise Greek Dictionary
ἰσχυρός ischuros 29x
strong, mighty, robust, Mt. 12:29; Lk. 11:21; powerful, mighty, 1 Cor. 1:27; 4:10; 1 Jn. 2:14; strong, fortified, Rev. 18:10; vehement, Mt. 14:20; energetic, 2 Cor. 10:10; sure, firm, Heb. 6:18
Abbott-Smith Greek Lexicon
ἰσχυρός, -ά, -όν
(< ἰσχύω), [in LXX for אֵל, גִּבּוֹר, עָצוּם, חָזָק, etc.;]
strong, mighty, powerful; of persons, as to body or spirit: Mt 12:29, Mk 3:27, Lk 11:21, 22, I Co 4:10 (opp. to ἀσθενής), He 11:34 (ἐν πολέμῳ), Re 5:2 10:1 18:21 19:18; οἱ πλούσιοι κ. οἱ ἰ., Re 6:15; τὰ ἰ. = οἱ ἰ. (cf. IV Ki 24:15), I Co 1:27; of God (cf. De 10:17), Re 18:8; compar., Mt 3:11, Mk 1:7, Lk 11:22, I Co 1:25 (τὸ ἀσθενὲς τ. θεοῦ) 10:22;
of things: λιμός, Lk 15:14; ἐπιστολαί (βαρεῖαι κ. ἰ.), II Co 10:10; κραυγή, He 5:7; φωνή, Re 18:2; παράκλησις, He 6:18; πόλις, Re 18:10; βρονταί, Re 19:6.†
Liddell-Scott-Jones — Greek-English Lexicon
ἰσχυρός (ischuros) — strong. ἰσχῡρός, ά, όν, (ἰσχύς) strong, especially of personal strength, [Refs 5th c.BC+]; of things, ἰ. βέλος [Refs 7th c.BC+]; ἰ. χθών hard, [Refs 4th c.BC+]; of food, indigestible, [Refs 5th c.BC+]; of taste, strong, [Refs 4th c.BC+]; of armies, ἰσχυροτέρα φάλαγξ [Refs 5th c.BC+]; of places, [Refs 5th c.BC+]; τὸ ἑαυτοῦ ἰ., opposed to τὰ τοῖς πολεμίοις ἰ., [Refs 5th c.BC+]; τὰ ἰσχυρότατα your strongest points, [Refs 5th c.BC+]; τὰ τῆς πόλεως ἰ. that in which the strength of the state lies, [Refs 4th c.BC+]; ὁρῶντες οὐδὲν ἰ. ἀπὸ τῶν Λεσβίων no show of strength, [Refs 5th c.BC+]; ἰ. τι πρὸς τὸ πρᾶγμ᾽ ἔχειν a strong point, [Refs 4th c.BC+]
2. powerful, ἄλοχος Διός [Refs 5th c.BC+]: comparative -ότερος, ἐς πειθώ [NT+3rd c.AD+]
3. forcible, violent, severe, σιτοδείη, ψύχη, [NT+5th c.BC+]; αἱ λίαν ἰ. τιμωρίαι violent, excessive, [Refs]; ὅρκος -ότατος, ἀνάγκαι -όταται, [Refs 5th c.BC+]; γέλως, ἐπιθυμίαι, etc., [Refs 5th c.BC+]; νόμος ἰ. severe, [Refs 5th c.BC+]; γνώμη -οτέρη more positive, [Refs 5th c.BC+]; τρόπῳ ᾧ ἂν δύνωνται -οτάτῳ Foed. cited in [Refs 5th c.BC+]; κατὰ τὸ ἰσχυρόν by main force, opposed to δόλῳ, [Refs 5th c.BC+]
4. of literary style, vigorous, [Refs 1st c.BC+]; also of syllables, strong, [Refs]
II. adverb -ρῶς strongly, with all force, ἐγκεῖσθαι [Refs 5th c.BC+]
II.2. very much, exceedingly, with adjectives, [Refs 5th c.BC+]; ἔθνος μέγα ἰ[Refs 5th c.BC+]; κίνησις νωθὴς ἰ. [Refs 5th c.BC+]: comparative -οτέρως[Refs 5th c.BC+]; -ότερον [Refs 5th c.BC+] most certainly, [Refs]