constant

1 not undergoing a change in condition <change is the only constant thing in the world of fashion> Synonyms changeless, stable, stationary, steady, unchanging, unvarying Related Words fast, fixed, hard-and-fast, immutable, inflexible, invariable, unalterable, unchangeable; established, set, settled; ceaseless, continuing, durable, enduring, lasting, permanent Phrases on an even keel (also on even keel) Near 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 appearing or occurring repeatedly from time to time <I get constant headaches during humid weather> Synonyms regular, frequent, habitual, periodic, periodical, repeated, steadyRelated Words continual, intermittent, recurrent, recurring; cyclic (or cyclical); around-the-clock, hourly, round-the-clock, 24-7 (or 24/7); chronic, confirmed, inveterate; expected, usualNear Antonyms episodic (also episodical), occasional; unexpected, unusualAntonyms inconstant, infrequent, irregular

3 firm in one's allegiance to someone or something <constant friends during times both good and bad> Synonyms faithful, dedicated, devoted, devout, down-the-line, fast, good, loyal, pious, staunch (also stanch), steadfast, steady, true, true-blueRelated Words dependable, dutiful, reliable, responsible, solid, tried, tried-and-true, trustworthy, trusty; unfaltering, unhesitating, unwavering; determined, intent, resolute; confirmed, dyed-in-the-wool, inveterate, sworn; ardent, avid, enthusiastic, fervent, fervid, gung ho, impassioned, passionate, seriousNear Antonyms irresponsible, undependable, unreliable, untrustworthy; faltering, hesitant, vacillating, wavering; dubious, irresolute, shaky, uncertain; apathetic, dispassionate, uninterestedAntonyms disloyal, faithless, false, fickle, inconstant, perfidious, recreant, traitorous, treacherous, unfaithful, untrue