Meaning of INSANITY in English
n. 25B6; noun
insanity runs in her family : MENTAL ILLNESS, madness, dementia; lunacy, instability; mania, psychosis; informal craziness.
it would be insanity to take this loan : FOLLY, foolishness, madness, idiocy, stupidity, lunacy, silliness; informal craziness.
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012