Synonyms of 'flinty'

adamant, adamantine, bony, callous, cast-iron, cement, concrete, constant, corneous, cruel, dense, dog-eat-dog, dour, dure, firm, fixed, granitic, grim, hard, hard-core, hardened, hardhearted, harsh, heartless, horny, immovable, immutable, impervious, implacable, inclement, inelastic, inexorable, inflexible, insensitive, intransigent, iron, ironlike, irreconcilable, lithic, lithoid, loyal, marble, merciless, obdurate, osseous, pachydermatous, petrogenic, pitiless, relentless, remorseless, resistive, rigid, rigorous, Rock, rock-ribbed, Rocky, ruthless, set, slaty, solid, sot, staunch, steadfast, steady, Stern, stiff, stone, stony, tough, true, unaffected, unalterable, unbending, unchangeable, uncompromising, unfeeling, unflappable, unforgiving, unmerciful, unmoved, unpitying, unrelenting, unremorseful, unshaken, unyielding