Containing, covered with, or resembling oil; having a greasy texture or appearance.
Middle English, from 'oil' + suffix '-y'. 'Oil' comes from Old French 'oile' and Latin 'oleum', ultimately from Greek 'elaion' meaning olive oil. The figurative sense of 'insincerely smooth' developed in the 16th century.
The word 'oily' carries a fascinating dual nature - while scientifically neutral when describing substances, it becomes deeply negative when applied to personality, suggesting someone who is slippery and untrustworthy. This semantic evolution mirrors our cultural associations with grease and slickness.
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