General Antonyms:
* Subdued: Less intense or glaring; muted.
* Tasteful: Pleasing in appearance and style; elegant.
* Elegant: Graceful and stylish; refined.
* Sophisticated: Having a refined and cultured appearance.
* Simple: Plain and unadorned.
* Classic: Timeless and elegant; not trendy or flashy.
* Neutral: Not showy or attention-grabbing; understated.
* Understated: Not attracting undue attention; subtle.
Antonyms Specific to Color:
* Soft: Gentle and muted in color.
* Pale: Light in color; not bright.
* Dull: Lacking brightness or intensity in color.
* Muted: Reduced in intensity or brightness; subdued.
The best antonym for "garish" will depend on the specific context in which the word is used.