improperness

NOUN /ɪm'prɑpərnɛs/
12 LETTERS · 4 SYLLABLES · STARTS WITH I

improperness is a valid 12-letter word worth 18 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1M3P3R1O1P3E1R1N1E1S1S1
1 + 3 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does improperness mean?