fixed

1 having been established and usually not subject to change the baseball card dealer's prices were fixed, so bargaining was not an option Synonyms certain, determinate, final, firm, flat, frozen, hard, hard-and-fast, inexpugnable, set, settled, stable Related Words nonadjustable, noncancelable, nonnegotiable, unchangeable; constant, steady, unchanging, uniform, unwavering; definite, exact, explicit, specific; given, stated, stipulated; dependable, good, reliable, responsible, safe, solid, sure, tried, tried-and-true, true, trustworthy, trusty Near Antonyms adjustable, changeable, negotiable; indefinite, open-ended, unspecified; capricious, changeful, flickery, fluctuating, fluid, inconstant, mercurial, mutable, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatile

2 not capable of changing or being changed interest accrues at a fixed rate Synonyms inflexible, hard-and-fast, immutable, inalterable, incommutable, invariable, unalterable, unchangeableRelated Words changeless, constant, determinate, established, set, settled, stable, steadfast, steady, unaltered, unchanging, unvarying; immovable, unmovableNear Antonyms adaptable, adjustable; fickle, fluctuating, inconstant, uncertain, unsettled, unstable, varying; plastic, pliable, pliant, supple, willowyAntonyms alterable, changeable, elastic, flexible, mutable, variable