paradox
US /ˈper.ə.dɑːks/
UK /ˈper.ə.dɑːks/

1.
a seemingly absurd or self-contradictory statement or proposition that when investigated or explained may prove to be well founded or true
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The statement "This statement is false" is a classic paradox.
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It's a strange paradox that the more you give, the more you have.
2.
a situation, person, or thing that combines contradictory features or qualities
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The film is a paradox of humor and tragedy.
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He is a paradox, both brilliant and incredibly naive.