The opposite of the adjective unknown would be known, identified, recognized, or acknowledged.
known
Unknown.
Knew
The opposite of famous (known) could be anonymous(unknown).The opposite of being famous (in a good way) would be infamous, nefarious, or disreputable.
The opposite of popular is unknown.
The opposite word for Idiopathic would be a specific diagnosis! Idiopathic in itself means unknown cause
The opposite could be new, recent, modern, or young.
Opposite by definition; " Having a position on the other or further side of something." Polar opposite, is essentially the opposite of something that is of the further* side. Ergo, all polar opposites are opposites, but not all opposites are polar. For example: Word: Famous (Known about by many people) A polar opposite: Infamous (Well known for some bad quality or deed) Ordinary opposite Unknown (Not known or familiar) In summary, a polar opposite, is an opposite of the word within the same 'field' if you will.
The opposite of known is unknown.
The opposite of famous (known) could be anonymous(unknown).The opposite of being famous (in a good way) would be infamous, nefarious, or disreputable.
unknown
Poor or unknown
The opposite of popular is unknown.
Unknown, obscure.
The opposite of famous would be unknown or obscure.
Unknown, obscure.
if you think of it as an opposite no the opposite of black is blue other your question is unknown
'Infamous' or 'unknown', according to context.
Famous?
Yes, it is (unknown reasons, unknown consequences). The word known is the past participle of the verb 'to know' and can act as an adjective. Unknown is the antonym (opposite) and means unidentifiable or mysterious.