ἀμαρτύρητος

ον, Adv.
A. needing no witness, E. HF 290, Antiph. 311. Adv. ἀμαρτ‐τί without witnesses, POxy. 1852.10 (vi A. D.).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project