unrelentingly
Unrelentingly is an adverb used to describe actions carried out with persistent, unwavering effort or force, without yielding, stopping, or letting up.
Etymology: It is formed from the prefix un- (negation) attached to relent (to yield or soften) plus
Usage: The term appears in formal or literary contexts and can describe persistent campaigns, labor, weather,
Examples: "The investigators searched unrelentingly for the truth." "The storm battered the coastline unrelentingly for days."
Nuance: The adverb stresses duration and intensity rather than speed; it may suggest harshness or resilience
Related terms: relentless (adjective), relent (verb), relentlessly (adverb), inexorably (adverb).