1. (noun)adjunct something added to another thing but not an essential part of it Antonyms: unsupportive, dominant
2. (noun)adjunct a person who is an assistant or subordinate to another Antonyms: unsupportive, dominant
3. (adj)adjunct a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence Antonyms: dominant, unsupportive