The term "high-maintenance" is often used to describe someone or something that requires a lot of attention, time, and effort to maintain. However, there are many synonyms that can be used to describe this same concept. Some examples include demanding, needy, fussy, picky, exacting, and sensitive. These words all convey the idea of something or someone that requires a great deal of care and attention in order to function properly. Whether it is a person who is high-maintenance or an object that requires constant attention, these words can be useful when describing such situations.