G3155
μάτην
in vain
μάτην (prop. accusative of μάτη, a fault, folly), adv., [in LXX for הָבַל, שָׁוְא, etc. ;] in vain, to no purpose: Mat.15:9, Mrk.7:7" (LXX) .† (AS)
The KJV translates G3155 in the following manner:
vain (4x)
Full Thayer's lexicon entry
μάτην — mátēn
μάτην (accusative (cf. Winers Grammar, 230 (216); Buttmann, § 131, 12) of μάτη, equivalent to ματία, a futile attempt, folly, fault), adverb, from Pindar, Aeschylus down, in vain, fruitlessly: Mat 15:9 and Mar 7:7, after Isa 29:13 the Sept..
2 occurrences
Matthew (1), Mark (1)