The term "un-due" refers to something that is inappropriate or not deserved. Its antonyms embrace words such as deserved, appropriate, worthy, fitting, and justified. Deserved refers to something that is earned through one's efforts or actions. Appropriate implies that something is suited to the circumstances or needs. Worthy relates to something that is deserving of recognition, respect, or admiration. Fitting implies that something is appropriate for a specific purpose, situation, or occasion. Justified suggests that something is supported by sound reasoning or evidence. The word "un-due" can be reversed with any of these terms, depending on the context in which it is used.