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adjective
hard, inflexible
Synonyms: annealed, arthritic, benumbed, brittle, buckram, cemented, chilled, congealed, contracted, creaky, firm, fixed, frozen, graceless, hardened, immalleable, impliable, incompliant, indurate, inelastic, jelled, mechanical, numbed, ossified, petrified, refractory, resistant, rheumatic, rigid, set, solid, solidified, starched, starchy, stark, steely, stiff as a board, stony, taut, tense, thick, thickened, tight, unbending, unflexible, ungraceful, unsupple, unyielding, wooden
Antonyms: flexible, pliable, pliant, soft
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adjective
formal, standoffish
Synonyms: angular, artificial, austere, ceremonious, cold, constrained, forced, hardheaded, headstrong, inflexible, intractable, labored, mannered, obstinate, pertinacious, pompous, priggish, prim, punctilious, relentless, starchy, stilted, strong, stubborn, uneasy, ungainly, ungraceful, unnatural, unrelaxed, unrelenting, wooden
Antonyms: casual, graceful, informal
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adjective
difficult
Synonyms: arduous, exacting, fatiguing, formidable, hard, laborious, tough, trying, uphill
Antonyms: easy
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adjective
extreme, severe
Synonyms: austere, brisk, cruel, drastic, exact, excessive, exorbitant, extravagant, great, hard, harsh, heavy, immoderate, inexorable, inordinate, oppressive, pitiless, potent, powerful, rigorous, sharp, steep, strict, stringent, strong, towering, unconscionable, undue, vigorous
Antonyms: calm, moderate, normal