ˈtheftless,a.rare. [f. theft + -less.] a. That is not a theft. b. Not liable to be stolen. 1656S. H. Gold. Law 68 How punisht he poor Achan for a theftless theft to see to?1803Leyden Scenes Infancy iv. 362 Teviot's sons..devoid of fear Bind to the rush by night the theftless steer.