Underact

[ʌndər'ækt] or [,ʌndɚ'ækt]

(verb.) act (a role) with great restraint.

Editor: Wilma--From WordNet

(v. t.) To perform inefficiently, as a play; to act feebly.

Editor: Xenia

v.t. to act a part inefficiently.—n. Underac′tion subordinate action: inefficient action.

Inputed by Josiah