ἄχρηστοςáchrēstos

useless, unserviceable: opposed to εὔχρηστος, Philemon 1:11.

Greek (New Testament) · G890

Same root

ΑA · G1the first letter of the alphabet; figuratively, only (from its use as a numeral) the first:
χρηστόςchrēstós · G5543employed, i.e. (by implication) useful (in manner or morals)

Where it appears

Appears 1 times in the Bible.

Philemon 1:11 Onesimus hasn’t been of much use to you in the past, but now he is very useful to both of us.

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