- 1not pleasant or comfortable synonym disagreeable an unpleasant experience The minerals in the water made it unpleasant to drink.
- 2unpleasant (to somebody) not kind, friendly or polite He was very unpleasant to me. She said some very unpleasant things about you. opposite pleasant
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adverb The drink is very sweet, but not unpleasantly so. He laughed unpleasantly.