Agnogenic (adj)
ag-noh-djen-ik
Of unknown origin or aetiology (medicine).
No, I don’t know what aetiology is either, but it’s going to be tomorrow’s WotD so we’ll all be really clever.
Example sentences
“The inflammation would appear randomly and was agnogenic with no obvious trigger being found.”
“Her rash appeared over night and refused to respond to any usual treatment methods, it’s cause is agnogenic.”

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