different between unspied vs unespied

English

un- +? spied

unspied (not comparable)

From Middle English unespied, onespied, unaspied, unaspyed, equivalent to un- +? espied.

unespied (not comparable)

Not espied or having been espied; unseen, unnoticed.
- 1590, Edmund Spenser, The Faerie Queene, III.1:
  So did she steale his heedelesse hart away, / And joyd his love in secret unespyde [...].

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