(用于 every，all 之后，表示强调)(一切)可能存在的,(一切)可能发生的;(用于 no 以后)根本
You use imaginable after a word like 'every' or 'all' to emphasize that you are talking about all the possible examples of something. You use imaginable after 'no' to emphasize that something does not have the quality mentioned.