The word "unthorough" means incomplete or superficial. Its antonyms are thorough, complete, meticulous, detailed, and exhaustive. When a task is thorough, it means it has been done with great care, attention, and detail. Something that is complete covers all the necessary aspects and leaves nothing out. When someone is meticulous, they are very precise and careful in their work. Detailed refers to something that is comprehensive and provides a lot of information. Finally, when something is exhaustive, it is comprehensive and covers all the necessary aspects of the task. So, the next time you come across the word unthorough, remember that its antonyms are thorough, complete, meticulous, detailed, and exhaustive.