insanity

n [U] madness; being mad 疯狂; 精神错乱: a plea of insanity, ie a plea in a court of law that a crime was due to the defendant having a mental disorder 精神失常的抗辩（在法庭上被告的辩护, 称作案时精神失常）.

inquiring, inquiringly, inquiry, inquiry (also enquiry), inquiry agent, inquisition, inquisitive, inquisitively, inquisitiveness, inquisitor, inquisitorial, inquisitorially, inroad, inrush, insalubrious, insalubrity, insane, insane asylum, insanely, insanitary, insatiable, insatiably, insatiate, inscribe, inscription, inscrutability, inscrutable, inscrutably, insect, insect-eating, insecticidal, insecticide, insectivore, insectivorous, insecure, insecurely, insecurity, inseminate, insemination, insensate,