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