Englishundemonstrative
adjective
my grandmother was an undemonstrative woman:
unemotional, unaffectionate, impassive, dispassionate;
self-contained, restrained, reserved, unresponsive, unmoved, unloving, unfriendly, unfeeling, passionless, wooden, uncommunicative, unforthcoming, sober, stiff, reticent, guarded, secretive, close, taciturn, aloof, distant, detached, remote, withdrawn;
cool, cold, cold-blooded, chilly, frosty, frigid, glacial;
informal standoffish, offish.
▷antonyms demonstrative, gushing.