Synonyms of hard

1 Syllable

set, firms, dour, raw, tough, thick, dry, stiff, drear, cruel, bang, drier, drying, strict, trying, ter, strong, driest, harsh, stern, firm

2 Syllables

crueler, firmest, brassier, firmer, strictest, knotty, lithic, hi-tech, rawest, thicker, bonier, hang-tough, ory, stannic, solid, hightech, keenly, rockier, hardshell, firmly, cruelest, tinniest, stale, madly, rainless, harshest, dense, harsher, dourer, tinny, unhewn, bullhead, dragger, ruthless, puzzling, painful, toucher, factual, thickest, packed, rigid, iron, stricter, roughhewn, stony, steely, gasser, high-tech, daedal, starched, petrous, zestless, stenchy, flinty, sterner, bony, squawky, knottier, actual, rawer, scratchier, brassy, nagging, stably, unwrought, scratchy, true-life, toughest, brutal, strenuous, compact, rough-hewn, unfried, grueling, osseous, bonder, toilful, smarting, rocky, stringent, troublous, tougher, steelier, pebbly, rockbound, tightly, callous, sternest, heartless

3 Syllables

rigorous, unpitying, inclement, fine-grained, nonporous, compressed, upsetting, procrustean, watchfully, malignly, hardnosed, fiercely, unstirred, disturbing, rancorous, austere, ballbuster, punishing, ossified, liverish, cold-hearted, backbreaking, unsettling, lustily, down-to-earth, sweepingly, hard-shelled, unfeeling, exacting, ruffianly, unyielding, compacted, hardened, forcibly, metallic, hardheaded, frenziedly, sinewy, thoroughly, herculean, demanding, hard-hearted, stiff-necked, coldhearted, hardhearted, realistic, hardboiled, pragmatic, appressed, full-toned, low-toned, onerous, sobering, relentless, labored, genuine, backbreaker, effortful, toilsome, geologic, severest, little-known, noisily, intently, mindfully, searchingly, desiccant, closely, merciless, out-of-key, out-of-tune, tuneless, perturbing, rabidly, speeded-up, stormily, durably, hurriedly, severer, compacting, heightened, untreated, unbaked, ungraded, feelingless, contemptuous, uncordial, unsparing, rocklike, fixedly, knockabout, resentful, bouldered, rock-ribbed, absurdly, intense

4 Syllables

troublesome, fossilized, iron-fisted, compassionless, intricate, close-grained, metallurgic, all-consuming, intensive, baritone, unmerciful, positive, laboriously, case-hardened, unrepenting, frighteningly, tigerishly, pragmatical, unmelodious, unmoistened, overtaxing, stonyhearted, assiduously, concentrated, no-nonsense, unperfected, unfashioned, stony-hearted, powerfully, commonsense, unfantastic, tiresome, unamusing, ironhearted, remorseless, operose, immalleable, inarguable, indurate, moistureless, obdurate, boresome, reticular, dementedly, deliriously, distractedly, senselessly, devotedly, turbulently, aversive, unshakeably, complicated, uneatable, unromantic, singleminded, unamiable, severely, iron-handed, coercively, ironfisted, infestive, alcoholic, obstinate, indurated, inflexible, recondite, lapidarian, stonelike, ludicrously

5 Syllables

undisputable, unpermissive, maleficiently, tiresomely, hysterically, insusceptible, impenetrable, oppressively, restrictively, tyrannically, honest-to-goodness, meticulously, consolidated, inexorable, unsympathetic, insensitive, incontestable, enervative, indigestible, uncomfortable, adamantine, nonsensically, psychotically, casehardened, unadaptable, naturalistic, incompressible, utilitarian, unpasteurized, unassailable, inalterable, attentively

6 Syllables

opinionative, uncompassionate, energy-consuming