Merciless is a synonym of relentless.
As adjectives the difference between merciless and relentless
is that merciless is showing no mercy; cruel and pitiless while relentless is unrelenting or unyielding in severity.
merciless
English
Adjective
(
en adjective)
showing no mercy; cruel and pitiless
Synonyms
* unmerciful
Derived terms
* mercilessness
Anagrams
*
relentless
English
Adjective
(
en adjective)
Unrelenting or unyielding in severity
Unremitting, steady and persistent
Derived terms
* relentlessness