imperturbableness imperturbable • imperturbably · · · Info · Definitions · Synonyms · Characters · · imperturbableness · · Text Latin · · Script 17 · · Length Definitions · · · (noun) calm and unruffled self-assurance. Synonyms: coolness, imperturbability. Example: "He performed with all the coolness of a veteran." · · Noun Definition 1 Synonyms · · · coolness · · Synonym 1 imperturbability · · Synonym 2 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075