Idiopathic (adjective)

1. Arising spontaneously or without a known cause.
2. A medical condition or a disease that is of unknown origin.

Origin:

The word "idiopathic" is derived from the greek word "idios" meaning own or specific and "pathos" meaning suffering. it refers to a disease or condition that arises spontaneously or without a known cause.

Examples:

1. Idiopathic pain is pain that occurs without a known cause.
2. His idiopathic condition caused him to lose a lot of weight.
3. The idiopathic nature of the disease made it difficult to diagnose and treat.
4. The idiopathic hypersomnia caused him to sleep excessively.
5. The idiopathic form of the disease had no known cure.