List of rigid synonyms and rigid related words.
abiding, accurate, adamant, adamantine, at a standstill, attentive, austere, buckram, careful, cast-iron, changeless, close, conscientious, constant, continuing, correct, critical, delicate, demanding, detailed, determined, direct, dogged, dour, draconian, durable, enduring, even, exact, exacting, exigent, express, exquisite, faithful, fine, finical, finicking, finicky, firm, firm as Gibraltar, fixed, flinty, frozen, fundamentalist, fussy, grim, hard, hard and fast, hard-core, hard-line, harsh, headstrong, hidebound, immobile, immotile, immotive, immovable, immutable, implacable, impliable, in buckram, inelastic, inerrable, inerrant, inexorable, infallible, inflexible, infrangible, intact, intransigent, inviolate, iron, ironbound, ironclad, ironhanded, irreconcilable, irremovable, lasting, literal, made of iron, mathematical, meticulous, micrometrically precise, microscopic, minute, mulish, muscle-bound, narrow, nice, obdurate, obstinate, orthodox, painstaking, particular, pat, permanent, perpetual, persevering, persistent, pigheaded, pinpoint, pokerlike, precise, precisianistic, precisionistic, prim, procrustean, punctilious, punctual, purist, puristic, puritan, puritanic, quiescent, ramrodlike, refined, relentless, religious, religiously exact, remaining, renitent, resolute, resolved, rigorist, rigoristic, rigorous, rock-ribbed, rockbound, rodlike, scientific, scientifically exact, scrupulous, scrutinizing, set, severe, single-minded, solid, sound, square, stable, standpat, starch, starched, starchy, static, stationary, staunch, staying, steadfast, steely, stern, stiff, stiff as buckram, stilted, stout, straightlaced, strait-laced, straitlaced, strict, stringent, strong, stubborn, sturdy, subtle, sustained, taut, tenacious, tense, thorough, tight, torpid, tough, unadaptable, unaffected, unalterable, unaltered, unbending, unbreakable, unchangeable, unchanged, unchanging, unchecked, uncompliant, uncompromising, undestroyed, undeviating, unerring, unfading, unfailing, unflexible, ungiving, unmovable, unmoved, unmoving, unqualified, unrelaxed, unrelenting, unshifting, unswerving, unvaried, unvarying, unwavering, unyielding, virgate