Adjective
Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves.
Source: Webster's dictionarythe merciless enemy Source: Internet
a merciless critic Source: Internet
gave him a merciless beating Source: Internet
Battle through diverse stages against relentless waves of punks and technologically-enhanced creatures like copter cats, T-Rexes, and merciless cyberchickens. Source: Internet
Beneath Mount Rushmore on the eve of Independence Day, President Trump addressed his holiday remarks to his narrow base of angry white voters while charging that advocates of racial justice are promoting a "merciless campaign to wipe out our history." Source: Internet
Accompanied by his merciless disciple, Darth Vader, he sets out on a rare personal mission to ensure his will is done. Source: Internet