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The ClueMore unctuous (6 letter answer)
NotesThe answer OILIER is seen occasionally, appearing about once every 900 puzzles.
Superior in lubricity
DefinitionOILY as an adjective:
1. (greasy, oily, sebaceous, oleaginous) = containing an unusual amount of grease or oil; "greasy hamburgers"; "oily fried potatoes"; "oleaginous seeds"
2. (buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous) = unpleasantly and excessively suave or ingratiating in manner or speech; "buttery praise"; "gave him a fulsome introduction"; "an oily sycophantic press agent"; "oleaginous hypocrisy"; "smarmy self-importance"; "the unctuous Uriah Heep"; "soapy compliments"
3. coated or covered with oil; "oily puddles in the streets"
4. (greasy, oily) = smeared or soiled with grease or oil; "greasy coveralls"; "get rid of rubbish and oily rags"