Mis-used is a term that indicates the incorrect use or application of something. Its antonyms would be words that represent correct usage, proper application, or appropriate action. Acceptable, useful, applicable, and purposeful are some of the antonyms for mis-used. Properly employed, suitably utilized, and efficiently exercised are other synonyms that reflect the right use of something or someone. These words can be applied to a wide range of contexts, from language to technology and medicine, among others. Therefore, knowing the antonyms of mis-used can help individuals to choose and use words or objects more accurately and effectively.