Garish (adjective)

1. Unpleasantly bright and showy in color or decoration.
2. Tastelessly or excessively bright or showy.
3. Unpleasantly loud or bold in appearance or style.

Origin:

The word "garish" comes from the old english word "gærsum" meaning showy, extravagant, or ostentatious. it has been in use since the late 16th century. .

Examples:

1. The decoration was garish and over the top.
2. The neon lights were garish and hurt her eyes.
3. The dress was too garish for the occasion.
4. The design was garish, with too many clashing colors.
5. The building had garish neon signs.