The term "ill judged" refers to something that was not well thought out or considered carefully enough, resulting in a poor decision or outcome. Some antonyms for this term could include "well-considered," "thoughtful," "wise," or "prudent." These words suggest that the decision or action was carefully weighed and considered, resulting in a positive outcome. Other antonyms might include "reasonable," "judicious," or "sensible," all of which imply a level-headed approach that resulted in a successful outcome. Whatever the antonyms, they all suggest a level of care and attention that was lacking in the original decision or action that was "ill judged.