unsusceptible

ADJECTIVE /,ənsə'sɛptɪbəl/
13 LETTERS · 5 SYLLABLES · STARTS WITH U

unsusceptible is a valid 13-letter word worth 19 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
U1N1S1U1S1C3E1P3T1I1B3L1E1
1 + 1 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 3 + 1 + 1 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does unsusceptible mean?