- undemonstrative
- adj1. unresponsive, uncommunicative, unaffectionate, distant, aloof; unexcitable, unemotional, unmoved, unstirred, unperturbed, unsusceptible, unimpressionable, unimpressible; apathetic, phlegmatic, listless, languid; lukewarm, neutral, nonchalant, indifferent; sedate, self-controlled, sober, staid, stoical, philosophical; reserved, shy, demure; calm, composed, poised, quiet, unruffled, placid, stiff, formal, Inf. tight, Sl. uptight.2. insensitive, unfeeling, uncompassionate, uncaring, heartless; unkind, pitiless, hard-hearted, cold-hearted, marble-hearted, stony-hearted; impervious, stony, steely, flinty; hardened, obdurate, callous, thick-skinned; unimpassioned, untouched, indurate, inured.
A Note on the Style of the synonym finder. 2014.