straight face straighten up • straight-faced · · · Info · Definitions · Characters · · straight face · · Text Common · · Latin · · Scripts 13 · · Length 2 · · Syllables Definitions · · · (noun) a serious facial expression giving no evidence of interest or amusement. Synonyms: straight face. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074