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