UNDECEIVED
undeceived, disabused(p)
(adjective) freed of a mistaken or misguided notion; “some people are still not disabused of the old idea that the universe revolves around the Earth”
Source: WordNet® 3.1
Verb
undeceived
simple past tense and past participle of undeceive
Adjective
undeceived (not comparable)
Not having been deceived.
Source: Wiktionary
UNDECEIVE
Un`de*ceive", v. t. Etym: [1st pref. un- + deceive.]
Definition: To cause to be no longer deceived; to free from deception,
fraud, fallacy, or mistake. South.
Source: Webster’s Unabridged Dictionary 1913 Edition