Synonyms of stiff in English:

stiff


See definition of stiff

adjective

1‘a sheet of stiff black cardboard’

SYNONYMS
rigid, hard, firm, hardened, inelastic, non-flexible, inflexible, ungiving
rare impliable, unmalleable
ANTONYMS

flexible, plastic, limp

2‘mix to a stiff paste’

SYNONYMS
semi-solid, viscous, viscid, thick, stiffened
firm, compact, dense
rare viscoid
ANTONYMS

runny

3‘her muscles were stiff’

SYNONYMS
aching, achy, painful
arthritic, rheumatic
taut, tight
informal creaky, rheumaticky, rusty
archaic stark
ANTONYMS

supple, limber

4‘she greeted him with stiff politeness’

SYNONYMS
formal, reserved, unfriendly, chilly, cold, frigid, icy, austere, unrelaxed, brittle, stand-offish, wooden, forced, constrained, strained, stilted
prim, punctilious, stuffy
informal starchy, uptight
ANTONYMS

relaxed, informal

5‘they face stiff fines and a possible jail sentence’

SYNONYMS
harsh, severe, hard, punitive, punishing, stringent, swingeing, crippling, rigorous, drastic, strong, heavy, draconian
ANTONYMS

lenient, mild

6‘the army had put up a stiff resistance’

SYNONYMS
vigorous, determined, full of determination, strong, spirited, resolute, tenacious, steely, four-square, unflagging, unyielding, dogged, stubborn, obdurate
North American rock-ribbed
ANTONYMS

half-hearted

7‘a long, stiff climb up the bare hillside’

SYNONYMS
difficult, hard, arduous, tough, strenuous, laborious, uphill, exacting, demanding, formidable, challenging, punishing, back-breaking, gruelling, Herculean
tiring, fatiguing, exhausting
informal killing, hellish
British informal knackering
archaic toilsome
ANTONYMS

easy

8‘a stiff breeze’

SYNONYMS
strong, vigorous, powerful, brisk, fresh, gusty
howling
ANTONYMS

gentle

9‘you need a stiff drink’

SYNONYMS
strong, potent, alcoholic, spirituous, intoxicant
ANTONYMS

weak