Used to scold someone for their lack of manners or proper behavior; "what kind of system is this?" or "whatever next?"

unbecoming; not according with decorum; scandalous behavior or speech that violates rules of propriety

not according with decorum; scandalous; bad form; unacceptable behavior

to be improper or in bad form; to lack a sense of decorum or dignity

To be beneath one's dignity or status; to fail to conform to standards of social etiquette or rules.