You are able to bear in mind the prefix non- usually means “not” by means of the phrase nonpoisonous, for a material that's nonpoisonous is “not” toxic. As an interjection to negate what was stated before or expose it as sarcasm, it really is attested by 1900, popularized 1989 by https://donovanteqzh.wikicommunications.com/4357643/rumored_buzz_on_taschen