'Infamous' or 'unknown', according to context.
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Unknown, obscure.
Apposite is a word, but you probably mean opposite. The opposite of doubt is certainty. Doubt and certainty are antonyms.
Famous is very well known for positive reasons. Being infamous is the opposite. For example, Winston Churchill is famous but Adolf Hitler would be best described as infamous..
rich and famous = riche et célèbre
The only famous one with the word "you" in it is "May the Force be with you."