Uncertain; changeable.--Johnson. That man's a slippery fellow; i. e. no dependence can be placed in him. One who is disposed to cheat or obtain undue advantage, is called a slippery fellow. It is used alike in England and America.--See Grose, Prov. Dict.
Merchants who resort to drumming as a means for selling their goods are apt to he considered as very slippery fellows.--Perils of Pearl Street.