Barbiturates, such as phenobarbital and secobarbital, are any of various derivatives of barbituric acid used especially as sedatives, hypnotics, and antispasmodics.
Barbiturates have largely been supplanted by Benzodiazepines (such as Valium, Xanax) due to addictive potential, extensive abuse, and severe withdrawal syndromes.
Used mainly in America by those unfamiliar with the derogative form of the word.
Also used: goof, goofball, goofy
"You're so goofy"