The term NIFFY is used to describe something that has a bad smell. The crossword solutions for this term are REEKING (7 letters), PUTRID (6 letters), STINKING (8 letters), and FUNKY (5 letters). All of these words are synonyms for having an unpleasant odor. REEKING implies a strong, pungent smell, while PUTRID suggests a rotting smell. STINKING is a more general term for a bad smell, and FUNKY is a slang term for a smell that is not necessarily bad, but is unusual.