Similar word to insusceptible:

aloof, bloodless, coldhearted, crass, feelingless, hard, hard as nails, hard-boiled, hardened, hardhearted, heartless, impassible, impassive, imperceptive, incurious, obtuse, stony, tactless, thick-skinned, tough, uncaring, unconcerned, unfeeling, unimpressionabl


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