mental effort

13 LETTERS · STARTS WITH M

mental effort is a valid 13-letter word worth 20 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

M3E1N1T1A1L1E1F4F4O1R1T1

3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 4 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does mental effort mean?