Indolent is an adjective that means lazy.

The Latin word dorere (doe LARE ay) means ‘to suffer or cause pain.’ This word added the prefix I-N to mean ‘not causing pain’ and became indolent in the mid 17th century. Initially it was used in a medical context to refer to a disease or condition that didn’t cause pain. But it soon came to also describe someone who wanted to avoid work or exertion. Here’s an example of indolent in use:

Marvin could be indolent at times, but at other times he could conquer his laziness and do whatever work needed to be done.