Definition of insane adjective in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the definition, pronunciation, and examples of the word insane , which can mean very annoyed, angry, upset, or excited, or very stupid, unreasonable, or dangerous. Also find out the offensive and old-fashioned meaning of insane , and how to say it in different languages. There are nine meanings listed in OED's entry for the word insane . See ‘ Meaning & use’ for definitions, usage, and quotation evidence. The adjective ' insane ' has its origins in the Latin word 'insanus,' which is a combination of 'in,' meaning 'not,' and 'sanus,' meaning 'sound' or 'healthy.' In its early use, ' insane ' directly referred to a lack of soundness or health, particularly in the context of one's mental state. It conveyed the idea of extreme mental instability, irrationality, or madness, indicating a departure from a sound and healthy state of mind. Over time, this term has continued to be associated with severe ...
