nonperformance nonperforating • nonperformer · · · Info · Definitions · Synonyms · Characters · · nonperformance · · Text Latin · · Script 14 · · Length Definitions · · · (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances. Synonyms: negligence, carelessness, neglect. · · Noun Definition 1 Synonyms · · · negligence · · Synonym 1 carelessness · · Synonym 2 neglect · · Synonym 3 Characters · · 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 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072