underact/ˌʌndərˈækt; ˌʌndɚ`ækt/ v[I, Tn]act (a part) with less spirit, force, etc than expected 表演（角色）不够尽心、 尽力等 He underacted the title-role to considerableeffect. 他演剧名角色演得很不带劲. Cf 参看 overact.
牛津英汉双解词典