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Douglas Harper's Etymology Dictionary
prelapsarian

"pertaining to the condition before the Fall," 1834, from pre- + Latin lapsus "a fall" (see lapse (n.)) + ending from unitarian, etc.

Wiktionary
prelapsarian

a. Of, or relating to the period of innocence before the Fall of man; innocent, unspoiled.

WordNet
prelapsarian

adj. of or relating to the time before the Fall of Adam and Eve

Usage examples of "prelapsarian".

Before the arrival of Gulliver, the Houyhnhnms, ideal but also funny, arrogant, and naive, were prelapsarian.