Synonyms of unsusceptible

1 Syllable
dead
2 Syllables
asleep, callous
3 Syllables
feelingless, unliable, benumbed, coldhearted, hardboiled, senseless, immune, deadened, unfeeling
4 Syllables
impassive, insensible, resistive, nonreactive, case-hardened, impassible
5 Syllables
insusceptible, insensitive, casehardened, imperceivable, anesthetized
6 Syllables
unimpressionable