Continuing without becoming weaker, less severe, etc.; showing no signs of stopping or lessening in intensity. The relentless heat of the desert made it difficult for the travelers to continue their journey.
Unyielding in severity or strictness; unremitting. Her relentless pursuit of perfection often left her feeling exhausted.
Persistent; not giving up or letting go. The relentless reporter continued to ask questions until she got the answers she needed.