The antonyms for the word "ex act" can be defined as imprecise, inexact, approximate, guesswork, and loose. The word "ex act" means to perform something accurately and precisely without any mistake or error. On the contrary, the opposite of ex act is to execute something inaccurately or carelessly without paying attention to details. These antonyms are generally used in contexts where precision is not required or to describe an action that is done hastily or carelessly. In conclusion, the antonyms of "ex act" highlight the importance of accuracy and precision in completing tasks, and also emphasize the negative impact that can arise if these qualities are not maintained.