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