One difference is that insane has a stronger meaning than crazy. More than 206 answers from native speakers about natural usage and nuances of insane. Insane has official synonyms such as 'mentally ill' and 'psychotic'.
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Insane usually sounds more serious, though. :) insane is also used in legal and medical terms, crazy is not. :) i hope that helps!.
Crazy and insane are synonyms that describe something extreme or intense.
Insane Used in phrases such as 'drive someone crazy' and idioms such as 'be as mad as a hatter', meaning to be completely crazy. Crazy and insane are almost the same, but each has a different connotation. Q&a about usage, example sentences, meaning and synonyms of word insane. Crazy can have a positive connotation in some contexts, but insane is almost always.
However, it is more serious and dangerous than insane crazy. Crazy and insane are synonyms.