relentless etymology

English word relentless comes from English relent (a dated word meaning to stay, stop or delay) and -less (a suffix which denotes a lack of some quality)

Detailed word origin of relentless

Dictionary entryLanguageDefinition
relent English (eng) Stay; stop; delay. (dated) To become less rigid or hard; to soften; to yield; to dissolve; to melt; to deliquesce.. (obsolete, transitive) To lessen, make less severe or fast.. To become less severe or intense; to become less hard, harsh, or cruel; to soften in temper; to become more mild and tender; to feel compassion.. To slacken; to abate.
-less English (eng) Lacking (something); without (something).
relentless English (eng) Unrelenting or unyielding in severity. Unremitting, steady and persistent.

Words with the same origin as relentless

Descendants of -less
breathless clueless countless defenseless fearless flawless hopeless meaningless merciless needless penniless pointless priceless regardless ruthless selfless senseless sleepless thoughtless timeless toothless topless useless wireless