"At disposal" implies that something is available for use or at someone's disposal. An antonym for this phrase would be "unavailable" or "not at hand". When something is not accessible, it cannot be used or accessed easily. Other antonyms for "at disposal" could include "inaccessible", "restricted", or "unusable". These words indicate that there are limitations or barriers preventing someone from accessing or using something. When something is not at someone's disposal, they may have to look for alternative solutions or resources to achieve their goals. In summary, antonyms for "at disposal" are words that suggest the absence or unavailability of something.