| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | unchangeable |
| Synonyms: | abiding, ageless, changeless, constant, enduring, fixed, immovable, inflexible, invariable, permanent, perpetual, sacrosanct, stable, steadfast, unalterable, unmodifiable |
| Antonyms: | alterable, changeable, flexible, mutable, variable |
| Main Entry: | constant |
| Part of Speech: | adjective |
| Definition: | fixed |
| Synonyms: | connected, consistent, continual, equable, even, firm, habitual, homogeneous, immutable, invariable, like the Rock of Gibralter, monochrome, monophonic, monotonous, nonstop, of a piece, permanent, perpetual, regular, regularized, solid as rock, stabile, stable, standardized, steadfast, steady, together, unalterable, unbroken, unchanging, unflappable, unfluctuating, uniform, uninterrupted, unvarying |
| Antonyms: | changeable, fickle, fluctuating, inconstant, irregular, unstable, unsteady, varying, wavering |
| Main Entry: | eternal |
| Part of Speech: | adjective |
| Definition: | without pause; endless |
| Synonyms: | abiding, ageless, always, amaranthine, boundless, ceaseless, constant, continual, continued, continuous, dateless, deathless, enduring, everlasting, forever, illimitable, immemorial, immortal, immutable, imperishable, incessant, indefinite, indestructible, infinite, interminable, lasting, never-ending, perdurable, perennial, permanent, perpetual, persistent, relentless, termless, timeless, unbroken, unceasing, undying, unending, unfading, uninterrupted, unremitting, without end |
| Antonyms: | brief, changeable, changing, ending, ephemeral, stopping, temporary, terminable, transient |
| Main Entry: | immovable |
| Part of Speech: | adjective |
| Definition: | fixed, stubborn |
| Synonyms: | adamant, constant, dead set on, dug in, fast, firm, hard-nosed, immobile, immotile, immutable, impassive, inflexible, intransigent, locked in, motionless, obdurate, quiescent, resolute, rooted, secure, set, set in concrete, set in stone, solid, stable, stand pat, stationary, steadfast, stick to guns, stuck, tough nut, unalterable, unchangeable, uncompromising, unmodifiable, unshakable, unwavering, unyielding |
| Antonyms: | mobile, movable, moving, unfixed |
| Main Entry: | indestructible |
| Part of Speech: | adjective |
| Definition: | lasting, unable to be destroyed |
| Synonyms: | abiding, deathless, durable, enduring, everlasting, immortal, immutable, imperishable, incorruptible, indelible, indissoluble, inexterminable, inextinguishable, inextirpable, irrefragable, irrefrangible, nonperishable, permanent, perpetual, unalterable, unbreakable, unchangeable, undestroyable, undying, unfading |
| Antonyms: | breakable, destructible, perishable |
| Main Entry: | inflexible |
| Part of Speech: | adjective |
| Definition: | stubborn |
| Synonyms: | adamant, adamantine, determined, dogged, dyed-in-the-wool, firm, fixed, hard, hard-and-fast, immovable, immutable, implacable, indomitable, inexorable, intractable, iron, obdurate, obstinate, relentless, resolute, rigid, rigorous, set, set in one's ways, single-minded, stand one's ground, staunch, steadfast, steely, stiff, strict, stringent, unadaptable, unbending, unchangeable, uncompliant, uncompromising, unrelenting, unswayable, unyielding |
| Antonyms: | flexible, reasonable, willing, yielding |
| Main Entry: | invariable |
| Part of Speech: | adjective |
| Definition: | not changing |
| Synonyms: | changeless, consistent, constant, fixed, immovable, immutable, inalterable, inflexible, monotonous, perpetual, regular, rigid, same, set, static, unalterable, unchangeable, unchanging, undiversified, unfailing, uniform, unmodifiable, unrelieved, unvarying, unwavering |
| Antonyms: | changeable, changing, variable, varying |
| Main Entry: | irrevocable |
| Part of Speech: | adjective |
| Definition: | fixed, unchangeable |
| Synonyms: | certain, changeless, constant, doomed, established, fated, final, immutable, indelible, inevitable, invariable, irremediable, irretrievable, irreversible, lost, permanent, predestined, predetermined, settled, unalterable, unrepealable, unreversible |
| Antonyms: | alterable, changeable, reversible, revocable |
| Main Entry: | permanent |
| Part of Speech: | adjective |
| Definition: | constant, lasting |
| Synonyms: | abiding, changeless, continual, diurnal, durable, enduring, everlasting, fixed, for keeps, forever, forever and a day, immutable, imperishable, in for the long haul, indestructible, invariable, long-lasting, perdurable, perduring, perennial, perpetual, persistent, set, set in concrete, set in stone, stable, steadfast, unchanging, unfading |
| Antonyms: | ephemeral, temporary |