Synonyms of unvarying

1 Syllable
smooth, plain
2 Syllables
even, surer, static, planar, sing-song, steadiest, steadier, smoothed, stablest, smoother, smoothest, singsong, evens, brick-wall, equal, fixed, stabler, constant, steady, surest, smoothing
3 Syllables
gridlocked, evener, regular, samely, unvaried, unchanging, uniform, unchanged, round-the-clock, aeonian, consistent, unwaning, equaled, continual, equable, evened, invariant, toneless, steady-going, stabile, frictionless
4 Syllables
fifty-fifty, invariable, monophonic, uninflected, monotonous, unaltered, unremitting, oft-repeated, monochrome, mirrorlike, unfluctuating, homogenous
5 Syllables
unmodifiable, undiversified, uninterrupted