10 letters · 17 points in Scrabble
noun illogicality as a consequence of having a conclusion that does not follow from the premisses
originEtymology tree English invalid Proto-Indo-European *-teh₂ Proto-Indo-European *-ts Proto-Indo-European *-teh₂ts Latin -itāsder. Old French -itebor. Middle English -ite English -ity English invalidity From invalid + -ity.
Etymology from Wiktionary, CC BY-SA 3.0