inalienable
unforfeitable
certain
changeless
constant
fated
fateful
immutable
incommunicable
incommutable
inconvertible
ineluctable
inert
inescapable
inevasible
inevitable
inexorable
inflexible
insusceptible of change
intransmutable
invariable
irresistible
irretrievable
irreversible
irrevocable
lasting
necessary
noble
noncommunicable
noncontagious
noninfectious
nonreturnable
nonreversible
permanent
relentless
resistless
reverseless
sure
sure as death
sure as fate
unalterable
unalterative
unaltered
unavoidable
unchangeable
unchanged
unchanging
uncontrollable
undeflectable
undeviating
advice.no
all-sufficing
culture-creating
dead-calm
fee simple
feodal
indivisible
much-prized
nonsyndromic
paralympic
prescriptive
rent-free
seigniorial
semi-secret
unalienable
uncontroulable
unproduced
unrepresentable
unshakable
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defeasible