Main Entry: id·io·path·ic Pronunciation: "id-E-&-'path-ik Function: adjective : arising spontaneously or from an obscure or unknowncause :PRIMARY <idiopathic epilepsy> <idiopathic hypertension> <idiopathicthrombocytopenic purpura> —id·io·path·i·cal·ly/-'path-i-k(&-)lE/adverb