The phrase "am on hand" is commonly used to mean "available" or "present." Antonyms for this phrase can include "unavailable," "absent," "not present," "away," or "out of reach." These words describe a lack of availability, indicating that the person or item in question is not accessible or within reach. "Unprepared" may also be considered an antonym, as being "on hand" often implies readiness or preparedness for a situation. These antonyms can provide a helpful contrast to the phrase "am on hand" and can be useful when expressing the opposite meaning.