13 letters · 16 points in Scrabble
originEtymology tree English non- English negotiate Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English negotiable English nonnegotiable From non- + negotiable.
Etymology from Wiktionary, CC BY-SA 3.0