11 letters · 14 points in Scrabble
adjective (sometimes followed by `to') causing harm or injury
originFrom Medieval Latin *dētrīmentālis, from Latin dētrīmentum (“harm”), from dēterō (“to rub off, wear”), from dē- (“down, away”) + terō (“to rub or grab”).
Etymology from Wiktionary, CC BY-SA 3.0