Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cessātor, ōris, m. [cesso], a loiterer, an idler, a dilatory person: non quo cessator esse solerem, praesertim in litteris, Cic. Fam. 9, 17, 3: de libris, Tyrannio est cessator, id. ad Q. Fr. 3, 5 (6), 6: nequam et cessator Davus, * Hor. S. 2, 7, 100; * Col. 11, 1, 16.