adamant, adamantine, affectless, anchored, anesthetized, arctic, at a standstill, autistic, blunt, cast-iron, catatonic, chill, chilly, cold-blooded, cold, cold as charity, coldhearted, constant, cool, determined, dispassionate, dogged, dour, drugged, dull, emotionally dead, emotionless, fast, firm, fixed, flinty, frigid, frosted, frosty, frozen, grim, hard-core, hard, heartless, icy, immobile, immotile, immotive, immutable, impassible, impassive, implacable, impliable, inalterable, inductile, inelastic, inexcitable, inexorable, inextensible, inextensile, inextensional, inflexible, insusceptible, intractable, intractile, intransigent, invariable, iron, irreconcilable, irremovable, irresilient, loyal, motionless, nonelastic, nonemotional, nonstretchable, obdurate, objective, obtuse, out of touch, passionless, pat, relentless, resolute, rigid, rigorous, riveted, rock-ribbed, rooted, self-absorbed, set, settled, sot, soulless, spiritless, stable, standpat, stationary, staunch, steadfast, steady, steely, stern, stiff, stony, stubborn, stuck, true, unaffected, unaffectionate, unalterable, unbending, unchangeable, uncompromising, undeflectable, unemotional, unextendible, unextensible, unfeeling, unflappable, unflexible, unflinching, ungiving, unimpassioned, unimpressionable, unlimber, unloving, unmalleable, unmodifiable, unmovable, unmoved, unmoving, unpassionate, unpliable, unpliant, unrelenting, unresponding, unresponsive, unshakable, unshakeable, unshaken, unsusceptible, unswerving, unsympathetic, untouchable, untractable, unwavering, unyielding