Impassive.
Deliberately impassive or expressionless.
Having such a face or look.
In a deadpan manner.
A style of comedic delivery in which something humorous is said or done while not exhibiting a change in emotion or facial expression.
To express (oneself) in an impassive or expressionless manner.
obtuse; dull
Having a dull or blunt and soft point
To render obtuse; to dull; to blunt.