na-adjective, noun
Describes a person, behavior, or taste that is coarse, lacking refinement, or in poor taste. Often used in contrast with 粋 (いき, 'stylish, chic').
See also: 無粋 (ぶすい)
彼の冗談は不粋で、場がしらけた。
His joke was vulgar and killed the mood.
あの派手なネクタイは不粋だと思う。
I think that flashy tie is unrefined.
Compound of 不 (bu, 'not') + 粋 (iki, 'stylish, chic'). The kanji 不 is a common negative prefix. The reading ぶいき is a standard on'yomi combination.