たちが悪わるい

expression, i-adjective

nasty; ill-natured; vicious; of bad character

Describes a person, behavior, or situation that is fundamentally unpleasant, mean-spirited, or troublesome. Often implies a deep-seated bad quality rather than a temporary mood.

Antonyms: たちがいい

• あの人ひとはたちが悪わるいから、あまり関かかわらないほうがいい。

  That person is nasty, so you'd better not get too involved.

• この風邪かぜはたちが悪わるくて、なかなか治なおらない。

  This cold is a nasty one and just won't go away.