Relentless means never easing, never stopping, never letting you rest. Relentless pressure, relentless rain, relentlessly cheerful.
It is admiring of people and exhausting of conditions: a relentless competitor is a compliment and relentless rain is not. The word is built on relent, meaning to soften, so relentless is literally unsoftening. Note relentlessly, which is used as an intensifier and usually carries a hint of complaint.
1adjectiverelentlessNever easing and never stopping.
“The relentless noise of the traffic kept me awake all night.”
synonyms: unrelenting, persistent
relentless is a quality of not easing.
Also accepted in games: unrelenting
Latin
re-
Anglo-Norman
relentir
Middle English
relenten
English
relent
English, today
relentless
Built from
From relent + -less. relent comes from Middle English relenten, from Anglo-Norman relentir, from Latin re- + lentare (“to bend”), from lentus (“soft, pliant, slow”). Earliest recording dates to 1526. The noun is from the verb.
Etymology from Wiktionary, CC BY-SA