Untreated (adjective)

Not having received any medical or therapeutic treatment or attention.

Origin:

Derived from the past participle of the verb 'treat' (late middle english), which means to deal with or handle a matter.

Examples:

1. The untreated wound became infected.
2. The untreated water from the stream was not safe for drinking.
3. The untreated timber was infested with termites.
4. The untreated fabric faded in the sun.
5. The untreated metal rusted quickly in the rain.