Synonyms to unimpressible

impassive, Olympian, affectless, aloof, anesthetized, apathetic, arctic, at rest, autistic, backward, bashful, blank, blunt, bored, bovine, callous, calm, careless, catatonic, chill, chilled, chilly, cloistered, cold, cold as charity, cold-blooded, coldhearted, collected, composed, constrained, contained, controlled, cool, deadpan, detached, discreet, disinterested, dispassionate, distant, drugged, dry, dull, dwindling, ebbing, emotionally dead, emotionless, empty, even-tempered, even-tenored, expressionless, fishy, forbidding, frigid, frosted, frosty, frozen, glassy, guarded, halcyon, hardened, heartless, heedless, hushed, icy, immovable, impassible, impersonal, imperturbable, inaccessible, incurious, indifferent, indurated, inexcitable, inexpressive, inirritable, insensible, insensitive, insentient, insouciant, insusceptible, introverted, isolated, lackadaisical, listless, matter-of-fact, mindless, modest, moldering, nonchalant, nonemotional, objective, obtuse, offish, out of touch, pacific, passionless, patient, peaceable, peaceful, phlegmatic, placid, poker-faced, quiescent, quiet, regardless, remote, removed