The Collaborative International Dictionary of English v.0.48:

Cunctator \Cunc*ta"tor\ (k?nk-t?"t?r), n. [L., lit., a delayer;
   -- applied as a surname to Q. Fabius Maximus.]
   One who delays or lingers. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

cunctator
    n 1: someone who postpones work (especially out of laziness or
         habitual carelessness) [syn: procrastinator, postponer,
         cunctator]