11 letters · 19 points in Scrabble
adjective not producing an intended effect
adjective producing no result or effect
adjective lacking in power or forcefulness
originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in-bor. Middle English in- English in- English effectual English ineffectual From in- + effectual.
Etymology from Wiktionary, CC BY-SA 3.0