Unvarying

Adjective

 * 1) persistent, constant or changeless
 * You can be sure of our unvarying attention.
 * 1) lacking variety; having a uniform character
 * The prizewinning carrots were of an unvarying size.

Thesaurus
abiding, accordant, alike, automatic, balanced, blah, broken-record, ceaseless, changeless, chattering, consistent, consonant, constant, continual, continuing, continuous, correspondent, drearisome, dreary, dry, dryasdust, dull, durable, dusty, enduring, equable, equal, even, everlasting, firm, fixed, flat, frozen, harping, homogeneous, humdrum, immobile, immutable, incessant, incommutable, inconvertible, indefeasible, inert, insusceptible of change, intact, intransmutable, invariable, inviolate, irretrievable, irreversible, irrevocable, jog-trot, lasting, level, long-winded, machine gun, measured, mechanical, methodic, monolithic, monotonous, noble, nonreturnable, nonreversible, of a piece, ordered, orderly, oscillating, perennial, permanent, perpetual, persistent, prolix, pulsating, quiescent, rapid, regular, remaining, repeated, reverseless, rigid, robotlike, singsong, smooth, solid, stabile, stable, staccato, static, stationary, staying, steadfast, steady, stuttering, sustained, systematic, tedious, torpid, treadmill, unalterable, unalterative, unaltered, unbroken, unceasing, unchangeable, unchanged, unchanging, unchecked, undeflectable, undestroyed, undeviating, undifferentiated, undiversified, uneventful, unfading, unfailing, uniform, unintermitted, unintermittent, unintermitting, uninterrupted, unmodifiable, unremitting, unrestorable, unreturnable, unruffled, unshifting, unstopped, unsusceptible, unvariable, unvaried, vibrating