Simple past tense and past participle of undeceive.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "undeceived" in a sentence
"But the first word undeceived him; and he let his head once more fall between the palms of his hands."
"In this tradition of comedy, the comedic text (or performance) presents a thoroughly undeceived view of human life, responding to "our endless and repetitive cycle of suffering, our horror of it, our inability to escape it," with unremitting laughter."
"They went to it, for three-minute rounds with a minute rests, and Sam Stubener was immediately undeceived."