The word "am duty" can be understood as a state of being responsible or obligated to perform a task or job. The antonyms for "am duty" are freedom, leisure, choice, and privilege. When a person is not on duty, they have the freedom to do as they please, and they have leisure time to pursue activities they enjoy. It's important to have a balance between duty and leisure to maintain a healthy lifestyle. A choice or privilege is also an antonym for "am duty" as they signify a lack of obligation or responsibility. In summary, the antonyms for "am duty" are freedom, leisure, choice, and privilege.