72 synonyms for constant such as dedicated, abiding, changeless, bosom, and committed. Constant is an adjective, and its antonyms are inconstant, fitful, and variable.
Abiding, ceaseless, continual, continuous, determined, dogged, endless, eternal, everlasting, incessant, interminable, never-ending, non-stop, perennial, perpetual, persevering, persistent, relentless, resolute, round-the-clock, sempiternal, steadfast, steady, sustained, tenacious, unabating, unbroken, unceasing, unending, unflagging, uninterrupted, unrelenting, unrelieved, unremitting, unshaken, unwavering, and without respite.
Changeless, consistent, even, fixed, immutable, invariable, level, regular, stable, steady, unchanging, undeviating, unfluctuating, uniform, and unvarying.
Boon, bosom, committed, dedicated, dependable, devoted, faithful, fast, firm, loyal, reliable, stalwart, staunch, steadfast, true, trustworthy, trusty, unswerving, and unwavering.