unalterable Synonyms

inalterable changeless well-balanced sustained substantial strong stout stiff steady steadfast stationary stable sound settled set rigid unavoidable uniform unyielding unfluctuating unstoppable nonmodifiable unvarying unchanged unmodifiable stabile set in stone long-standing unaltered undeviating unchangeable unchanging reverseless refractory immutable immovable hard fixed firm final FAST enduring durable constant consistent certain cast iron inductile inelastic inflexible