Unguinous is an adjective that describes something as having an OILY or greasy texture. It is often used to describe the texture of certain foods, such as fried foods, or the texture of certain substances, such as petroleum. The term is derived from the Latin word unguis, which means 'NAIL' or 'CLAW'. The crossword solution for unguinous is 'OILY', which accurately describes the greasy texture of the substance or food in question.