immutable Synonyms

changeless perpetual undying unexceptionable uniform unlimber unoriginated unpenetrable unending unchanging unalterable unchangeable undeviating unappealable timeless steady persisting persistent reverseless rigid ruffianly sempervirent sempiternal stable static stationary steadfast unadaptable unaltered nonmodifiable unadjustable unchallengeable unvaried unconvertible undiscouraged undiversified undividable unexchangeable unfluctuating uninjectable hard and fast unvarying age-long unfading robotlike long-lasting long-term carved in stone set in stone unmodifiable