The word most fervid denotes intense passion or enthusiasm. Its antonyms can be words such as apathetic, indifferent, uninvolved, and dispassionate. Apathetic suggests a lack of interest or concern about something. Indifferent means having no preference or showing no emotion. Uninvolved indicates a lack of association or participation. Dispassionate implies a lack of strong emotion or biased judgement. These antonyms are suitable to use in contexts where someone wishes to express that they do not have a strong emotional response to a given topic. By using these antonyms, a writer or speaker can convey the opposite of most fervid with appropriate nuance.