Antonyms for "free" include restricted, confined, captive, jailed, imprisoned, enslaved, bound, and obligated to pay. A concept that is free is known to be unbridled, limitless, or without any constraints, while its antonyms refer to the opposite idea of having limitations, restrictions, or boundaries. For instance, freedom is synonymous with autonomy, independence, and sovereignty; concepts that are antonymous to the above-stated antonyms. In a nutshell, antonyms of "free" refer to captivity, obligation, restriction, or confinement, pointing towards a state of bondage rather than autonomy. It is essential to understand the antonyms of any term to grasp its full meaning and implications.