1) Cunctator 2) Dawdler 3) Delayer 4) Postponer 1) Cunctator 2) Delayer 3) Postponer 4) Someone who postpones work 
• (n.) One who procrastinates, or defers the performance of anything.
Pro·cras'ti·na`tor noun One who procrastinates, or defers the performance of anything. 
[n] - someone who postpones work (especially out of laziness or habitual carelessness)
procrastinator Someone who puts off doing something until some other time (if at all); a delayer, a postponer, a malingerer, a shirker, and an evader.
postponer noun someone who postpones work (especially out of laziness or habitual carelessness)