The term 'least likely' can be described by four different words: RAREST, ODDEST, LAST, and LAMEST. RAREST is the adjective used to describe something that is not common or is rarely seen. ODDEST is the adjective used to describe something that is strange or unusual. LAST is the adjective used to describe something that is at the end of a sequence or list. LAMEST is the adjective used to describe something that is weak or lacking in strength. All four words can be used to describe something that is the least likely to happen or occur.