i-adjective
Colloquial adjective describing something visually flashy or overdone, especially makeup, clothing, or decoration. Often carries a negative or critical tone.
See also: けばけばしい
彼女の化粧はちょっとケバいと思う。
I think her makeup is a bit gaudy.
あの看板、色がケバくて目立つね。
That sign is so garish it really stands out, huh.