Also means
gullible
Usage Note
Dupe is used predicatively: être dupe means 'to be taken in' or 'to be fooled'. The negative ne pas être dupe ('not to be fooled') is very common: je ne suis pas dupe de ses manoeuvres ('I'm not taken in by his schemes'). As a noun une dupe means 'a gullible person'.
Examples
"Il n'est pas dupe de leurs mensonges."
Natural Translation
He is not fooled by their lies.

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