un·der·act (ndər-ăkt)
v. un·der·act·ed, un·der·act·ing, un·der·acts
v. tr.
► To perform (a role) weakly or with insufficient expressiveness.
► To understate (a role) intentionally; underplay.
v. intr.
To perform in an understated way.

[TahlilGaran] American Dictionary ▲