u 1 n 1 l 1 e 1 s 1 s 1
6 letters · 6 points in Scrabble
Meaning
originFrom Middle English unlesse, earlier on lesse (modern on + less), from (not) on lesse (than) (“(not) on a less compelling condition (than)”). The quality of negation in the word and the lack of stress changed on to un-.
Etymology from Wiktionary, CC BY-SA 3.0