Garish means overly bright, bold or showy in appearance. It often refers to something that is too colorful and eye-catching, sometimes even considered tasteless or vulgar.
It doesn't try to attract the eye with garish displays of insanity like Mad Catz do with their M.O.U.S.E. line, at least. (wolfsgamingblog.com)
Cecily Brown's exhibition at the Drawing Center, the first devoted exclusively to her works on paper, delivered everything we expect from the artist: sex, violence, prurient gestural marks, and bursts of garish color. (artforum.com)