#dawdler__drone__laggard__lagger__trailer  someone who takes more time than necessary; someone who lags behind
  supertype:  idler__loafer__do-nothing__layabout__bum  person who does no work
  subtype:  loiterer__lingerer  someone who lingers aimlessly in or about a place
  subtype:  slowpoke__plodder__stick-in-the-mud__slowcoach  someone who moves slowly; "in England they call a slowpoke a slowcoach"
  subtype:  putterer__potterer  a person who putters about
  subtype:  straggler__strayer  someone who strays or falls behind

No statement uses or specializes dawdler; click here to add one.