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

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

The show was merciless with its satirical barbs against top government officials and current events, just as its parent company Paramount Skydance has pushed to acquire Warner Bros Discovery. — Erik Pedersen, Deadline, 19 May 2026