invalidness invalidly • invalidship · · · Info · Definitions · Synonyms · Characters · · invalidness · · Text Latin · · Script 11 · · Length 4 · · Syllables Definitions · · · (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses. Synonyms: invalidity. · · Noun Definition 1 Synonyms · · · invalidity · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073 v latin small letter v U+0076