13 letters · 22 points in Scrabble
adjective not worthy of trust or belief
originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English trustworthy English untrustworthy From un- + trustworthy.
Etymology from Wiktionary, CC BY-SA 3.0