unaltered (adj.)
- abiding
- changeless
- constant
- continuing
- durable
- enduring
- firm
- fixed
- frozen
- immobile
- immutable
- incommutable
- inconvertible
- indefeasible
- inert
- intact
- invariable
- inviolate
- irretrievable
- irreversible
- irrevocable
- lasting
- noble
- nonreturnable
- nonreversible
- permanent
- perpetual
- persistent
- quiescent
- remaining
- rigid
- solid
- stable
- static
- stationary
- steadfast
- sustained
- torpid
- unalterable
- unchangeable
- unchanged
- unchanging
- unchecked
- undeviating
- unfading
- unfailing
- unmodifiable
- unremitting
- unsusceptible
- unvaried
- unvarying
