Commission is commonly defined as a fee paid to a person or organization for selling a product or providing a service. Antonyms for the word "be commission" could include words such as free, volunteer, unprofitable, or unconditional. If something is described as free, then it does not come with any cost or fee attached. A volunteer would work for no payment, and unprofitable means that something will not generate any revenue. On the other hand, unconditional means that there are no limitations or conditions attached to an agreement or offer. Overall, these antonyms offer a stark contrast to the typical monetary compensation associated with a commission.