Dec 9, 2012 · The meaning of MERCILESS is having or showing no mercy : pitiless. How to use merciless in a sentence.

/ ˈmɜr·sɪ·ləs / Add to word list showing no kindness; cruel: a merciless enemy

If you describe someone as merciless, you mean that they are very cruel or determined and do not show any concern for the effect their actions have on other people.

Definition of merciless adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Aug 18, 2025 · merciless (comparative more merciless, superlative most merciless) Showing no mercy; cruel and pitiless. quotations

MERCILESS definition: without mercy; having or showing no mercy; pitiless; cruel. See examples of merciless used in a sentence.

merciless (adjective) merciless / ˈ mɚsɪləs/ adjective Britannica Dictionary definition of MERCILESS [more merciless; most merciless] : having or showing no mercy : very cruel or harsh

There are six meanings listed in OED's entry for the word merciless, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Use the adjective merciless to describe someone who acts in a cruel, heartless way. You could accuse your rabbit-hunting brother of being merciless. Merciless is the antonym, or opposite, …

1. kindness towards a person, especially an enemy, who is in one's power.