D an opinion expresses how someone feels about something while a fact can be proven
The unctuous homemade ointment had an unpleasant texture and smell, but it worked wonders.
Unctuous was originally used to describe the beneficial act of healing, but today word typically has a negative meaning. The word is derived from the Latin verb unguere, which means "to anoint," and from which the words unguent, which means "a soothing or curative salve," and ointment also derive.
Unctuous may have been used to describe objects distinguished by an unnatural gloss of sentimentality because of the oily quality of ointments. Unctuous people may have the best of intentions, but their fake sincerity can leave a bad taste in other people's mouths, much like some ointments.
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