"Impenned" means to be confined or enclosed in a space. Some commonly used synonyms for this word are "penned up", "bounded", "enclosed", "trapped", "restricted", "encircled", and "hemmed in". These words express the idea of being confined or restricted in movement. Other similar words include "caged", "corralled", "immured", "encaged", "imprisoned", "incarcerated" and "fenced in". These words imply a sense of confinement, restriction, or limitation of freedom of movement. Regardless of the situation, these synonyms for "impenned" are useful in either creative or professional writing to describe the same idea in different ways.