The term 'shiftless one' is a derogatory term used to describe someone who is lazy and does not work. This term can be broken down into three words: BUM (3 letters), IDLER (5 letters), and TRAMP (5 letters). A BUM is someone who is homeless and has no job, an IDLER is someone who is idle and does not work, and a TRAMP is someone who travels from place to place without any particular purpose. All three words refer to someone who is shiftless and does not work.