Answer:

underact

AnswerCrossword Clue
UNDERACTHardly emote
UNDERACTPerform with subtlety
UNDERACTPerform with restraint.
UNDERACTPlay with too great restraint.
UNDERACTPlay down, as a role
UNDERACTJust walk through a role, say
UNDERACTOpposite of ham