Synonyms of unimpressionable

1 Syllable
dead
2 Syllables
callous, asleep
3 Syllables
senseless, deadened, benumbed, unfeeling
4 Syllables
impassive, insensible, case-hardened, impassible, nonreactive
5 Syllables
casehardened, unemotional, insusceptible, unsusceptible, anesthetized