When we say something is "too deep," we often mean it is too complex or difficult to understand. However, there are several alternative words or phrases we can use to convey this same meaning. For example, we may say something is "overly complicated," "beyond comprehension," or "incomprehensible." We could also use phrases such as "too intricate," "beyond one's depth," or "too convoluted." Each of these synonyms can help us avoid repetition and add variety to our phrasing while still conveying the idea that something is too complex or difficult to understand.