- (transitive) to reveal the truth to (someone previously misled or deceived); enlighten
WordReference Random House Unabridged Dictionary of American English © 2026
un•de•ceive
(un′di sēv′),USA pronunciation v.t., -ceived, -ceiv•ing.
un′de•ceiv′a•ble, adj.
un′de•ceiv′er, n.
- to free from deception, fallacy, or mistake.
- un-2 + deceive 1590–1600
un′de•ceiv′er, n.
Collins Concise English Dictionary © HarperCollins Publishers::
undeceive /ˌʌndɪˈsiːv/ vb
'undeceive' also found in these entries (note: many are not synonyms or translations):