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 is the antonym, or opposite, of "merciful." If a person shows no mercy or pity, she is merciless. This can describe a cruelly violent person, or it can be more figurative: "The …