1. Consisting of oil; containing oil; having the nature or qualities of oil; unctuous; oleaginous; as, oily matter or substance. Bacon. 2. Covered with oil; greasy; hence, resembling oil; as, an oily appearance. 3. Smoothly subservient; supple; compliant; plausible; insinuating. "This oily rascal." Shak. His oily compliance in all alterations. Fuller. Oily grain (Bot...