- The definition of relentless is persistent or unyielding.
An example of relentless is a four-hour sand storm in the desert.
relentless definition by Webster's New World
- not relenting; harsh; pitiless
- persistent; unremitting
relentless definition by American Heritage Dictionary
- Unyielding in severity or strictness; unrelenting: relentless persecution.
- Steady and persistent; unremitting: the relentless beat of the drums.
- re·lentˈless·ly adverb
- re·lentˈless·ness noun