The antonyms for "all-powerful," meaning having complete and unlimited power or authority, can include powerless, helpless, weak, feeble, limited, and inadequate. These antonyms describe entities that lack the ability to control or command their environment, either due to external constraints or personal limitations. A person who is powerless, for example, may be dependent on others for basic needs, such as food and shelter, and unable to affect change in their circumstances. Similarly, an organization or government may be classified as inadequate or limited if it lacks the resources or capacity to achieve its goals or meet the needs of its constituents.