1) Binding 2) Confirmed 3) Constant 4) Definite 5) Immutable 6) Incommutable 7) In stone 8) Lasting 9) Permanent 10) Set 11) Unalterable 12) Writteninstone 1) Carved in stone 2) Changeless 3) Confirmed 4) Constant 5) Fixed 6) Frozen 7) Lasting 8) Permanent 9) Set in stone 10) Stable 11) Static 12) Unalterable 13) Unchanging 
[adj] - not changeable or subject to change
adjective not changeable or subject to change; `a fixed and unchangeable part of the germ plasm`-Ashley Montagu; `the unchangeable seasons`; `one of the unchangeable facts of life`