untreated

Everyday

1. An untreated illness or injury has not been given medical care. tree →
2. Untreated water, sewage or materials have not been cleaned or processed with chemicals. tree →
3. Untreated wood has not been painted or protected. tree →

In the lessons

Used in health («left untreated»), science and environment («untreated sewage flowed into the river»), and DIY. It warns the reader of danger or harm.

Examples

• Left untreated, the cut became infected. tree →
• The cough got worse because it went untreated. tree →
• Untreated water can carry germs. tree →
• Untreated sewage was pumped into the sea. tree →
• Untreated wood will rot in the rain. tree →
• Tooth decay can cause pain if it is untreated. tree →

Note

Common phrase: «if left untreated» (if nobody gives care). Not the same as «mistreated» (treated badly or cruelly).