Definition of "underacting" []

• Present participle of underact. (verb)

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• "This film, if nothing else, is a master-class in underacting."
• "With his typical underacting, Corbett couldn't even manage to pull that off."
• "At first the actor seemed to be phoning in one of his patented slow-burn performances (Hopkins, like Orson Welles, has a way of overacting when he's underacting: he can be utterly still and still seem to be doing too much)."