- idle ► ADJECTIVE (idler, idlest) 1) avoiding work; lazy. 2) not working or in use. 3) having no purpose or basis: idle threats.► VERB 1) spend time doing nothing. 2) (of an engine) run slowly while disconnected from a load or out of gear.DERIVATIVES idleness noun idler noun idly adverb.ORIGIN Old English, «empty, useless».
English terms dictionary. 2015.