stiff

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

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

Synonyms: arduous exacting fatiguing formidable hard laborious tough trying uphill

Antonyms: easy

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