unvarying (adj.)

• abiding
• accordant
• alike
• automatic
• balanced
• ceaseless
• changeless
• consistent
• consonant
• constant
• continual
• continuing
• continuous
• correspondent
• dreary
• dry
• dull
• durable
• dusty
• enduring
• equable
• equal
• even
• everlasting
• firm
• fixed
• flat
• frozen
• homogeneous
• humdrum
• immobile
• immutable
• incessant
• incommutable
• inconvertible
• indefeasible
• inert
• intact
• invariable
• inviolate
• irretrievable
• irreversible
• irrevocable
• lasting
• level
• long-winded
• measured
• mechanical
• monolithic
• monotonous
• noble
• nonreturnable
• nonreversible
• ordered
• orderly
• oscillating
• perennial
• permanent
• perpetual
• persistent
• prolix
• quiescent
• rapid
• regular
• remaining
• repeated
• rigid
• robotlike
• singsong
• smooth
• solid
• stabile
• stable
• staccato
• static
• stationary
• steadfast
• steady
• sustained
• systematic
• tedious
• torpid
• unalterable
• unaltered
• unbroken
• unceasing
• unchangeable
• unchanged
• unchanging
• unchecked
• undeviating
• undifferentiated
• undiversified
• uneventful
• unfading
• unfailing
• uniform
• uninterrupted
• unmodifiable
• unremitting
• unruffled
• unsusceptible
• unvaried