G0101
ἀδυνατέω
be impossible
ἀδυνατέω, -ῶ (ἀδύνατος), [in LXX: Deu.17:8, Zec.8:6 (פּלא ni.), Job.42:2 (בּצר ni.), al. ;] __1. Abbott-Smith omits this number to be unable (cl., Philo; π., see MM, VGT, see word). __2. In LXX and NT (Kennedy, Sources, 124; Hatch, Essays, 4; Field, Notes, 46 f.), to be impossible: Mat.17:20, Luk.1:37. † (AS)
Full Thayer's lexicon entry
ἀδυνατέω — adynatéō
ἀδυνατέω, (ῶ: future ἀδυνατήσω; (ἀδύνατος);
a. not to have strength, to be weak; always so of persons in classic Greek
b. a thing ἀδυνατεῖ, cannot be done, is impossible; so only in the Sept. and N. T.: οὐκ ἀδυνατήσει παρά τῷ Θεῷ (τοῦ Θεοῦ L marginal reading T Tr WH) πᾶν ῤῆμα, Luk 1:37 (the Sept. Gen 18:14) (others retain the active sense here: from God no word shall be without power, see παρά, I.
b. cf. Field, Otium Norv. pars iii. at the passage); οὐδέν ἀδυνατήσει ὑμῖν, Mat 17:20 (Job 42:2).
2 occurrences
Matthew (1), Luke (1)