musclebound /ˈmʌsəlˌbaʊnd/ adjective3 •Having pronounced muscle development through weightlifting, bodybuilding, or other physical exercise.Work til you're musclebound all night long / Gotta work til you're musclebound all night long — 1981 •(disapproving) Having excessive muscle (sometimes with implications of correspondingly inferior intellect). •Ungainly as a result of muscle over-development. formsmore musclebound · most musclebound