The antonyms for the word "cause understand" are perplex, baffle, confuse, bewilder, and mystify. These terms are used to describe situations where an individual has difficulty comprehending or interpreting something. For instance, if somebody is confused by a particular set of instructions, they might feel baffled or bewildered. Similarly, if somebody is unable to understand a complex scientific theory, they might describe it as mystifying. These antonyms illustrate the different ways in which people can struggle to understand information or ideas, and the importance of clear communication and explanations in overcoming these challenges.