Unremitting is an adjective that means incessant or never relaxing. 

The root word of our word of the day is remit, which goes back to the early 20th century and is derived from the Latin word remittere (ree ma TARE ay) which means ‘send back’ or ‘restore.’ An unremitting person refuses to be sent back or to restore anything. Here’s an example:

Monica’s unremitting demeanor didn’t always make her popular at the office, but she was a great boss just the same. Sometimes a strong leader has to be someone who just keeps on the attack.