not understand

14 LETTERS · STARTS WITH N

not understand is a valid 14-letter word worth 15 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
N1O1T1U1N1D2E1R1S1T1A1N1D2
1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 1 + 2 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does not understand mean?

1