When we struggle to understand something, we might say that we "fail to comprehend." However, there are many other ways to express this sentiment. One might say that they "cannot fathom" or "have difficulty grasping" the concept. They could also describe themselves as being "baffled," "confused," or "perplexed." Other synonyms include "bewildered," "stumped," or "puzzled." At times, one might even feel "lost" or "dumbfounded." When faced with a complex topic or idea, it's important to remember that there are many ways to express our lack of understanding. By using different interchangeable phrases, we can more accurately communicate what we mean and seek help when needed.