Synonyms of insusceptible

1 Syllable
crass, hard, tough
2 Syllables
stony, bloodless, tactless, unkind, aloof, heartless
3 Syllables
incurious, feelingless, hardened, thick-skinned, unliable, coldhearted, hardhearted, immune, uncaring, obtuse, hard-boiled, unfeeling
4 Syllables
impassive, resistive, unconcerned, impassible
5 Syllables
unresponsive, unsusceptible, inexcitable, imperceptive
6 Syllables
unimpressionable