Extended Strong's Greek Lexicon (Abbott-Smith based)
helpful
Usage: εὔ-χρηστος, -ον (εὖ, χράομαι), [in LXX: Pro.31:13 (חֵפֶץ), Wis.13:13 * ;] useful, serviceable: with dative of person(s), 2Ti.2:21; id. before εἰς, with dative of thing(s), 2Ti.4:11; opposite to ἄχρηστος, Phm 11.† (AS)