Unswerving is a related term of relentless.
As adjectives the difference between unswerving and relentless
is that unswerving is not deviating; not yielding or straying or varying while relentless is unrelenting or unyielding in severity.
unswerving
English
Adjective
(
en adjective)
Not deviating; not yielding or straying or varying.
:They followed the ritual with unswerving faith.
relentless
English
Adjective
(
en adjective)
Unrelenting or unyielding in severity
Unremitting, steady and persistent
Derived terms
* relentlessness