"undeceived" in the verb sense
1. undeceive
free from deception or illusion
"undeceived" in the adjective sense
1. disabused, undeceived
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® (An amazing lexical database of English)
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