oilier; oiliest
Definition of oily
1
: of, relating to, or consisting of oil
2a
: covered or impregnated with oil
oily rags
b
: relatively high in naturally secreted oils
oily skin oily hair
3
: excessively smooth or suave in manner
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Merriam-Webster unabridged
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Time Traveler for oily
The first known use of oily was in the 14th century
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