Question

Which is the most subtle nonverbal facial expression?

toothy grin
rolling eyes
flexing jaw muscle
grimacing frown

Answer 1

The most subtle nonverbal facial expression among the options provided would likely be the **flexing jaw muscle**. This expression can indicate tension, stress, or concentration and may not be as immediately recognizable as the others, which are more overt in their meanings. A toothy grin, rolling eyes, and grimacing frown are generally more explicit and easily interpreted by others.