No is an English word indicating rejection, disagreement, refusal or making a negative response or exclamation. It is the opposite of yes. Several programs aimed at children advocate the refusal skill of "saying no" in regard to high-risk behaviors, violence, drug, or sexual matters. For example the American television advertising campaign Just Say No in the 1980s aimed at spreading awareness about saying "no" to recreational drug use, violence, premarital sex, and other vices. Syntax In English, no is used more broadly than yes. No stands by itself as a grammatically sufficient and well-formed response to questions that can be answered yes or no. No also functions as a negative determiner, and can appear before any class of noun: count nouns (No cats are herbivores), mass nouns (There is no sugar in my tea) and abstract nouns (No peace is unwelco