early 15c., from un- (2) "reverse, opposite of" + seal (v.). Similar formation in Middle Dutch ontsegelen, Old High German intsigilan. Related: Unsealed (late 14c.).
He unsealed the letter
unscathed
unschooled
unscramble
unscriptural
unscrupulous
unseal
unsearchable
unseasonable
unseasoned
unseat
unsecure
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