unchangeable (adj.)

• abiding
• accordant
• adamant
• adamantine
• alike
• automatic
• balanced
• cast-iron
• changeless
• consistent
• consonant
• constant
• continuing
• continuous
• correspondent
• dour
• durable
• enduring
• equable
• equal
• even
• firm
• fixed
• flat
• flinty
• frozen
• grim
• hard
• hard-core
• homogeneous
• immobile
• immovable
• immutable
• implacable
• inalterable
• incommutable
• inconvertible
• indefeasible
• inelastic
• inert
• inexorable
• inflexible
• intact
• intransigent
• invariable
• inviolate
• iron
• irreconcilable
• irretrievable
• irreversible
• irrevocable
• lasting
• level
• measured
• mechanical
• monolithic
• noble
• nonreturnable
• nonreversible
• ordered
• orderly
• permanent
• perpetual
• persistent
• quiescent
• regular
• relentless
• remaining
• rigid
• rigorous
• robotlike
• rock-ribbed
• smooth
• solid
• stable
• static
• stationary
• steadfast
• steady
• steely
• stern
• stiff
• sustained
• systematic
• torpid
• unaffected
• unalterable
• unaltered
• unbending
• unbroken
• unchanged
• unchanging
• unchecked
• uncompromising
• undeviating
• undifferentiated
• undiversified
• unfading
• unfailing
• uniform
• unmodifiable
• unmovable
• unmoved
• unrelenting
• unremitting
• unruffled
• unsusceptible
• unvaried
• unvarying
• unyielding