15 letters · 18 points in Scrabble
noun a lack of attentiveness (as to children or helpless people)
noun the trait of not being considerate and thoughtful of others
originEtymology tree English inattentive Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English inattentiveness From inattentive + -ness.
Etymology from Wiktionary, CC BY-SA 3.0