Synonyms of merciless

merciless

adjective

ˈmər-si-ləs 

as in ruthless

having or showing a lack of sympathy or tender feelings

she is a merciless competitor at board games of any kind

Synonyms & Similar Words

• ruthless
• stony
• pitiless
• brutal
• hard
• oppressive
• harsh
• unmerciful
• cruel
• abusive
• remorseless
• heartless
• stern
• callous
• vicious
• inhuman
• compassionless
• malicious
• unsparing
• hateful
• tough
• grim
• inhumane
• soulless
• unfeeling
• obdurate
• insensitive
• take-no-prisoners
• hard-hearted
• unsympathetic
• uncharitable
• cold-blooded
• insensate
• thick-skinned
• slash-and-burn
• severe
• indurate
• savage
• affectless
• pachydermatous
• desensitized
• hard-boiled
• case-hardened
• thoughtless
• uncaring
• rough
• ironhearted
• heedless
• unthinking
• mean
• stonyhearted
• ungentle
• unfriendly
• boorish
• inconsiderate
• spiteful
• malevolent
• unloving
• virulent
• cold
• disagreeable
• rough-and-tumble
• heavy-handed
• brutish
• barbarous
• surly
• ironfisted
• acrimonious
• bestial
• jackbooted
• sledgehammer
• rancorous
• ill-natured
• ironhanded
• hard-bitten
• evil-minded
• ill-tempered
• austere
• frosty
• knock-down, drag-out

Antonyms & Near Antonyms

• sympathetic
• warm
• sensitive
• merciful
• gentle
• humane
• compassionate
• charitable
• benevolent
• kind
• kindly
• mild
• tender
• lenient
• friendly
• kindhearted
• indulgent
• gracious
• softhearted
• warmhearted
• tenderhearted
• cordial
• benignant
• loving
• tolerant
• affectionate
• good-natured
• understanding
• clement
• fond
• good-tempered

Example Sentences

Recent Examples of merciless

Soon enough, Karl’s seemingly foolproof blackmail scheme devolves into a merciless, dog-eat-dog fight for survival, and the two men are locked in a cutthroat collision course, their fates now inextricably linked. — Ryan Lattanzio, IndieWire, 15 July 2026

Humility is the posture; the standard is merciless. — Luis E. Romero, Forbes.com, 19 June 2026

Having catalogued the Black Death’s horrifying effects, Ibn Khatima went on to outline a series of preventative measures and active treatments designed to combat this merciless scourge. — Literary Hub, 27 May 2026

The jokes on social media will be endless, and opposing fans will be merciless. — Fort Worth Star-Telegram, 20 May 2026