adjective
1.
unresponsive to what might normally excite interest or emotion
impassive endurance of pain
Synonyms: apathetic, dry, matter-of-fact, phlegmatic, stoic, stolid
Related Word: calm, cold, cool; collected, composed, dispassionate, emotionless, imperturbable, inexcitable, unexcitable, unflappable; inexpressive, reserved, reticent, taciturn, unemotional, unexpressive; bovine, passionless, placid, spiritless, unconcerned, wooden; callous, hardened, indurated, insensible; cold-blooded, coldhearted, heartless
Contrasted words: compassionate, sympathetic, tender, warm, warmhearted
Antonyms: responsive
2.
Synonyms: insusceptible , insensitive, insentient, unimpressible, unimpressionable, unresponsive, unsusceptible