(superl.) Consisting of oil; containing oil; having the nature or qualities of oil; unctuous; oleaginous; as, oily matter or substance.
(superl.) Covered with oil; greasy; hence, resembling oil; as, an oily appearance.
(superl.) Smoothly subservient; supple; compliant; plausible; insinuating.
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Webster, Noah. Entry for 'Oily'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/o/oily.html. 1828.