unvarying

1 not undergoing a change in condition an unvarying dedication to the welfare of her community Synonyms changeless, stable, stationary, steady, unchanging, constantRelated Words fast, fixed, hard-and-fast, immutable, inflexible, invariable, unalterable, unchangeable; established, set, settled; ceaseless, continuing, durable, enduring, lasting, permanentNear Antonyms adaptable, alterable, changeable, flexible, mutable, variable; ephemeral, evanescent, fleeting, momentary, transient, transitory; kaleidoscopic, phantasmagoric (or phantasmagorical)Antonyms capricious, changeful, changing, fickle, fluctuating, fluid, inconstant, mercurial, skittish, uncertain, unpredictable, unsettled, unstable, unsteady, varying, volatile

2 not varying unvarying temperatures and humidity are best for the preservation of ancient artifacts Synonyms even, invariant, steady, unchanging, undeviating, uniform, unwaveringRelated Words fixed, immutable, invariable, set, unalterable, unchangeableAntonyms changing, deviating, nonuniform, unsteady, varying