niff

noun

a bad smell

verb (intr)

to smell badly; stink

Derived Formsniffy, adjective

Word Origin for niff

C20: perhaps from sniff

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012