Below are possible answers for the crossword clue Not-to-be-believed.
4 letter answer(s) to not-to-be-believed
SHAM
a person who makes deceitful pretenses
adopted in order to deceive; "an assumed name"; "an assumed cheerfulness"; "a fictitious address"; "fictive sympathy"; "a pretended interest"; "a put-on childish voice"; "sham modesty"
False
make a pretence of; "She assumed indifference, even though she was seething with anger"; "he feigned sleep"
make believe with the intent to deceive;
something that is a counterfeit; not what it seems to be
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