FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

adunatos ἀδύνατος — ad-oo'-nat-os — from 1 (as a negative particle) and 1415; unable, i.e. weak (literally or figuratively); passively, impossible:--could not do, impossible, impotent, not possible, weak.

see GREEK for 1

see GREEK for 1415