As adjectives the difference between imperishable and decayless
is that imperishable is not perishable; not subject to decay; indestructible; enduring permanently; as, an imperishable monument; imperishable renown while decayless is undecaying, imperishable.
imperishable
English
Adjective
(head)
Not perishable; not subject to decay; indestructible; enduring permanently; as, an imperishable monument; imperishable renown.
References
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decayless
English
Adjective
(-)
undecaying, imperishable