There are quite a few synonyms for the term "single man" that may prove useful for writers, speakers, or anyone else looking to expand their vocabulary. Some examples include "bachelor," "unmarried man," "lonely heart," "confirmed bachelor," and "solitary gentleman." Each of these options brings its own connotations and nuances, such as the sense of loneliness or independence associated with "solitary gentleman." Depending on the context and intentions of the speaker or writer, any of these synonyms might be more appropriate than others. In general, however, all of them help to convey the idea of an adult male who is not currently in a romantic relationship.