lasting
non-water-soluble
permanent
water-insoluble
firm
inseparable
insoluble
adulterous
causal
connubial
familial
federative
fraternal
inalienable
incestuous
incorporeal
indestructible
indissoluable
inviolable
irrevocable
matrimonial
self-existent
self-governing
symbiotic
tenuous
unbegotten
unbreakable
unchangeable
underived
undivided