13 letters · 15 points in Scrabble
adjective unaffected by self-interest
originFrom disinterest (“to cause to be impartial”, verb) + -ed (suffix forming past tense or past participle forms of verbs), or from dis- (prefix meaning ‘not’) + interested (“having a stake in; showing interest”, adjective).
Etymology from Wiktionary, CC BY-SA 3.0