Synonyms for Rigid:

adj.

all (adjective)
strict, stiff.
doctrinaire (adjective)
stiff-necked.
extreme (adjective)
extreme.
hard (adjective)
callous, firm, hard, stiff, solid.
inelastic (adjective)
immovable, unalterable, inflexible, stiff, inelastic, unyielding, firm.
obstinate (adjective)
contrary, stubborn, adamant, hidebound, resolute, bull-headed, unbendable, inelastic, unyielding, inflexible, bovine, mulish, hardheaded, obdurate, uncompromising, pertinacious, Pig-headed, bigoted, obstinate, brass-bound, tenacious, hard-nosed.
rocklike (adjective)
hard.
severe (adjective)
stern, strict, ascetic, bleak, brusque, severe, cutting, acerbic, icy, correct, inflexible, dour, prudish, stark, uncompromising, obdurate, brisk, austere, meticulous, caustic, blunt, stiff-necked, spartan, raw, draconian, cool, gruff, relentless, harsh, puritanical, censorious, precise, fundamental, frosty, rigorous, unbending, keen, intense, hidebound, grim, piquant, intolerant, disciplined, crisp, authoritarian, sharp, curt, chilly, astringent, acute, stringent, obstinate, imperial, tart, demanding, dry, lean, short, strait-laced, acrimonious, abrupt, exacting, critical, spare, oppressive, basic.
stiff, strict, severe (adjective)
definite, unbending, fixed, firm, austere, uncompromising, hard, unyielding, exact, invariable, Incompliant, unalterable, strait-laced, stern, adamantine, adamant, rigorous, solid, inflexible, stringent, set, inelastic, obdurate, unbreakable, harsh, intransigent, unmoving, unchanging.
tight (adjective)
dense, tense, stiff, firm, taut, snug, secure, tight.

n.

constant, final, unchanging, unvarying, irreversible, whatever happens, for good. ironclad, inalterable, conservative, immutable, bloody-minded, narrow, closed, narrow-minded, unchangeable, invariable, opinionated. paralyzed, implacable, resist, intransigent, iron, stuck, adamantine, uncompliant, die-hard, Incompliant, catatonic, stunned, brassbound, remorseless, rooted/glued/frozen to the spot, immobile. rigid (noun)
stiff, semirigid, intolerant, nonmoving, fixed, strict, inflexible, unadaptable, unmoving, set, unbending.
stiff (noun)
unbreakable.
strict (noun)
exact, definite.

Other synonyms:

brassbound, catatonic, immobile, closed, rock-hard, final, narrow-minded, inalterable, unvarying, adamantine, constant, ironclad, bloody-minded, irreversible, Incompliant, unchanging, uncompliant. immutable, stuck, intransigent, implacable, unchangeable, packed, impenetrable, die-hard, stunned. conservative, invariable, narrow, remorseless, paralyzed. iron. tough.

Usage examples for rigid

  1. He stood still then, suddenly rigid – The Safety Curtain, and Other Stories by Ethel M. Dell
  2. Gradually her face became less rigid and her eyes less wild. – David Elginbrod by George MacDonald
  3. He struggled for a few moments and became rigid – Who Goes There? by Blackwood Ketcham Benson