What are synonyms for improved? What is the opposite of Improve? Synonyms for improve in Free Thesaurus. Find more ways to say improved, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Antonyms for improve. Synonyms for improvement in Free Thesaurus. Synonyms-thesaurus.com is more than 70,800 synonyms and 47,200 antonyms available. 26 synonyms of enhance from the Merriam-Webster Thesaurus, plus 58 related words, definitions, and antonyms. 5 synonyms of improvement from the Merriam-Webster Thesaurus, plus 34 related words, definitions, and antonyms. Synonyms for improved in Free Thesaurus. Find another word for developed. Find another word for enhance. Antonyms for improvement. 34 synonyms of developed from the Merriam-Webster Thesaurus, plus 118 related words, definitions, and antonyms. Antonyms for improved. Another word for better. Find more ways to say better, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Fast is an antonym of slow. Antonyms for improve include impair, deteriorate, ruin, diminish, disimprove, decrease, hinder, recede, reduce and lessen. Improvement: an instance of notable progress in the development of knowledge, technology, or skill. Find more opposite words at wordhippo.com! Antonyms for Improve (opposite of Improve). These antonyms of the word improve are provided for information only. Here you use the antonyms for improve. See more. Antonym definition, a word opposite in meaning to another. 1 antonym for improved: unimproved. Another word for improved. Find another word for improvement.