ἀναμάρτητοςanamártētos

sinless

Greek (New Testament) · G361

Meanings

1. without missing, unerring.

2. In moral sense, faultless, without sin: John 8:7.

Same root

ΑA · G1the first letter of the alphabet; figuratively, only (from its use as a numeral) the first:
ἁμαρτάνωhamartánō · G264properly, to miss the mark (and so not share in the prize), i.e. (figuratively) to err, especially (morally) to sin

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.