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The doubt. The doubt. The doubt.
No Doubt - No Doubt album - was created in 1990.
if your referring to the band, its no doubt. and if you're talking about the expression, it is also no doubt.
The word 'doubt' is both a noun (doubt, doubts) and a verb (doubt, doubts, doubting, doubted).
EXAMPLES
noun: There is some doubt that the project will be funded.
verb: I doubt that story that the witness gave.
beyond shadow of a doubt