ἄνιπτοςániptos

unwashed: Matthew 15:20, Mark 7:2 (Mark 7:5 Rec).

Greek (New Testament) · G449

Same root

ΑA · G1the first letter of the alphabet; figuratively, only (from its use as a numeral) the first:
νίπτωníptō · G3538to cleanse (especially the hands or the feet or the face); ceremonially, to perform ablution

Where it appears

Appears 2 times in the Bible.

Matthew 15:20 These are what defile you. Eating with unwashed hands will never defile you.”
Mark 7:2 They noticed that some of his disciples failed to follow the Jewish ritual of hand washing before eating.

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