adjective
relating to or denoting any disease or condition that arises spontaneously or for which the cause is unknown
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The patient was diagnosed with idiopathic pulmonary fibrosis, a condition with an unknown cause.
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They couldn't figure out why he was having those idiopathic seizures.
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Doctors are still scratching their heads over her idiopathic migraines.
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The sudden disappearance of the birds from the park was like an idiopathic event, leaving everyone baffled.