When it comes to describing being "tied up" there are a number of synonyms to choose from. Some common alternatives include "bound," "restrained," "knotted," "shackled," "trussed," and "tethered." Depending on the context, other options might include "detained," "stuck," "busy," or "occupied." In many cases, the specific word choice will depend on the degree to which the person or object is immobilized, as well as the reason behind the restraint. Regardless of the chosen synonym, "tied up" can convey a sense of helplessness or being unable to move as desired, which can be used to great effect in a variety of storytelling contexts.