'imperishability' originates from English, specifically from the adjective 'imperishable' combined with the nominalizing suffix '-ity', where the prefix 'im-' meant 'not' and the root 'perish' traces back to Latin 'perire' meaning 'to perish'.

'imperishability' developed from the adjective 'imperishable' (formed in modern English from Latin-rooted 'perish' + prefix 'im-') — 'perish' came into Middle English via Old French 'perir' from Latin 'perire' ('per-': intensive + 'ire' 'to go'), and the modern English noun was formed by adding '-ity' to the adjective.

Initially the root 'perire' meant 'to pass away, to perish'; with the negative prefix 'im-' it became 'not to perish' (imperishable), and over time the abstract noun 'imperishability' came to denote the general quality of being unable to perish or decay.