Beefcake refers to a well-built, muscular man with an imposing appearance. This term uses the imagery of a juicy piece of meat, which is why it's often associated with a robust and hearty physique. Some antonyms for beefcake include skinny, puny, emaciated, scrawny, weakling, and pip-squeak. These words denote men who lack physical strength or are slimmer and more spindly in build, with a less imposing physique. Other antonyms for beefcake may include terms that focus more on personality traits, such as weak-willed, timid, or unassertive, which signify a lack of confidence, courage, or determination in a man.