gaudy
GAW-deeadjMeaning too bright or showy in a tasteless way
Memory hook GAW-dy: everyone GAWKS at it. Uncle Marcus wears a neon-pink tie, sparkly sunglasses, a party hat and six necklaces to the family picnic; everyone gawks, because his outfit is gaudy.
The gaudy sweater had blinking lights, sequins and a plastic snowman sewn on the front.
In context The old diner had a simple charm until the new owner covered it in gaudy decorations: neon flamingos, flashing arrows and gold plastic palm trees.
Similar showy, flashy, loud, tasteless
Opposite tasteful, elegant, understated
From gaud, an old word for a showy trinket.