mental instability

18 LETTERS · STARTS WITH M

mental instability is a valid 18-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

M3E1N1T1A1L1I1N1S1T1A1B3I1L1I1T1Y4

3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does mental instability mean?