niff /nɪf/noun 2verb 1forms 3 noun2 •(UK, informal) A bad smell.Whew, there's a bit of a niff in here. Is that your socks? •A sulk or sullen mood.'I don't see you need to get in such a niff,' said Katie. — 2008 verb1 •(informal) To smell bad; to stink. formsniffed · niffing · niffs
