- not relenting; not yielding or swerving in determination or resolution, as of or from opinions, convictions, ambitions, ideals, etc.; inflexible: an unrelenting opponent of the Equal Rights Amendment.
- not easing or slackening in severity: an unrelenting rain.
- maintaining speed, effort, vigor, intensity, rate of advance, etc.: an unrelenting attack.
- refusing to relent or take pity; relentless; merciless
- not diminishing in determination, speed, effort, force, etc
