11 letters · 17 points in Scrabble
adjective not by design or artifice; unforced and impromptu
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 contrived English uncontrived From un- + contrived.
Etymology from Wiktionary, CC BY-SA 3.0