Pocket Thesaurus
Synonyms of rigid
uncompromising, stringent, austere, harsh, solid, hard-line, definite, unyielding, inflexible, intransigent, stern, rigorous, adamant, fixed, exact, bullheaded, changeless, determined, firm, hard, inelastic, inexorable, invariable, obdurate, set, single-minded, static, strait-laced, unalterable, unbending, unbreakable, unchanging, unmoving, unrelenting, adamantine, incompliant, chiseled, dead set, locked in, set in stone, tough nut to crack, undeviating, unpermissive
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