That would be taste.
grimace
hear
there are 63,360 inches in a mileand it makes me smile when i pass my science test
answer this blink sneeze smile laugh shiver twitch
I need more context
I'll Never Smile Again by Tommy Dorsey
Taste
A grimace is a contorted or painful expression. The opposite could be a smile, or a relaxed appearance.
The opposite of a warm smile would probably be a ferocious grimace, or an evil glare. The opposite type of smile could be a condescending sneer.
It takes about 17 muscles to smile and 43 to frown
14 when you smile 43 when you frown
She winced in pain and tried to hide her grimace behind a forced smile.
The opposite of frown is smile.
It is the opposite of a smile. ^^y
smile,grin
Frown a smile takes 17 musles and a frown takes 43 musles
It take more facial muscles to frown than to smile.
I think sneer's antonym may be: friendly...?