The phrase "find insane" can be replaced with various synonyms depending on the context of its usage. In certain instances, one could opt for phrases such as "discover abnormal" or "unearth lunacy." In more casual situations, someone may say "spot crazy" or "detect madness." For a more formal setting, phrases like "ascertain madness" or "perceive insanity" could be used. Additionally, the word insane itself has a variety of synonyms with varying levels of intensity, including deranged, unhinged, irrational, or mentally ill. It is crucial to choose the appropriate synonym for the context in which it is used, to avoid incorrect interpretations.