9 letters · 16 points in Scrabble
adjective (of memory) deficient in retentiveness or range
adjective not mindful or attentive; - G.B.Shaw
adjective failing to keep in mind
originFrom Middle English *forgetful, *forȝetful (suggested by derivative forgetfulnesse, forȝetfulnesse (“forgetfulness”)), equivalent to forget + -ful.
Etymology from Wiktionary, CC BY-SA 3.0