unassailableness

16 LETTERS · 6 SYLLABLES · STARTS WITH U

unassailableness is a valid 16-letter word worth 18 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

U1N1A1S1S1A1I1L1A1B3L1E1N1E1S1S1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does unassailableness mean?