unchanging

1 not undergoing a change in condition took comfort in unchanging family traditions Synonyms changeless, stable, stationary, steady, constant, unvaryingRelated 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 wore an unchanging expression of boredom throughout the entire lecture Synonyms even, invariant, steady, uniform, undeviating, unvarying, unwaveringRelated Words fixed, immutable, invariable, set, unalterable, unchangeableAntonyms changing, deviating, nonuniform, unsteady, varying