What are the opposite words for voluntary?

The antonyms for the word voluntary are compulsory, forced, mandatory, necessary, and coerced. While voluntary implies a sense of free will and choice, its antonyms suggest the opposite. Compulsory refers to something that must be done, regardless of personal preferences. For instance, wearing helmets while riding a bike is compulsory. Similarly, forced suggests an action that is done under compulsion or duress. Mandatory means it is required by law or rules. Necessary implies that something is essential or needed. Finally, coerced refers to something done unwillingly or with external pressure. Antonyms of voluntary are, therefore, the opposite of voluntary, reflecting a lack of choice or freedom in decision-making.