卑怯
Common
I-adj
Noun
1
adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi)
cowardly;craven
2
adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi)
unfair;mean;sneaky;dirty;dastardly
そんなふうに言うなんて卑怯だ。
It's mean of you to talk that way.