immutable (adj.)
- abiding
- accordant
- adamant
- adamantine
- aged
- alike
- all-knowing
- all-powerful
- almighty
- ancient
- antique
- balanced
- boundless
- cast-iron
- changeless
- chronic
- consistent
- consonant
- constant
- continuing
- continuous
- correspondent
- creative
- diligent
- dogged
- dour
- durable
- enduring
- equable
- equal
- eternal
- even
- evergreen
- everlasting
- faithful
- firm
- fixed
- flat
- flinty
- frozen
- glorious
- good
- grim
- hallowed
- hard
- hard-core
- hardy
- holy
- homogeneous
- immobile
- immortal
- immovable
- implacable
- inalterable
- incommutable
- inconvertible
- indefatigable
- indefeasible
- indomitable
- industrious
- inelastic
- inert
- inexorable
- inextensible
- infinite
- inflexible
- insistent
- intact
- intractable
- intransigent
- invariable
- inveterate
- invincible
- inviolate
- iron
- irreconcilable
- irretrievable
- irreversible
- irrevocable
- just
- lasting
- level
- limitless
- long-lasting
- long-lived
- long-standing
- long-term
- loving
- loyal
- luminous
- macrobiotic
- majestic
- making
- measured
- mechanical
- merciful
- monolithic
- noble
- nonreturnable
- nonreversible
- numinous
- obstinate
- omnipotent
- omnipresent
- omniscient
- one
- ordered
- orderly
- patient
- perdurable
- perennial
- permanent
- perpetual
- persevering
- persistent
- persisting
- pertinacious
- plodding
- preoccupied
- quiescent
- radiant
- rapt
- regular
- relentless
- remaining
- resolute
- rigid
- rigorous
- robotlike
- rock-ribbed
- sacred
- sedulous
- shaping
- single-minded
- sleepless
- smooth
- solid
- sovereign
- stable
- static
- stationary
- steadfast
- steady
- steely
- stern
- stiff
- stubborn
- supreme
- sustained
- systematic
- tenacious
- timeless
- tireless
- torpid
- tough
- ubiquitous
- unaffected
- unalterable
- unaltered
- unbending
- unbounded
- unbroken
- unchangeable
- unchanged
- unchanging
- unchecked
- uncompromising
- unconquerable
- undaunted
- undefined
- undeviating
- undifferentiated
- undiscouraged
- undiversified
- unfading
- unfailing
- unfaltering
- unflagging
- unflinching
- uniform
- uninterrupted
- unlimited
- unmalleable
- unmodifiable
- unmovable
- unmoved
- unrelenting
- unremitting
- unruffled
- unsleeping
- unsusceptible
- unswerving
- untiring
- unvaried
- unvarying
- unwavering
- unwearied
- unwearying
- unyielding
- vital
