"greasier" in the adjective sense
1. greasy, oily, sebaceous, oleaginous
containing an unusual amount of grease or oil
"greasy hamburgers"
"oily fried potatoes"
"oleaginous seeds"
2. greasy, oily
smeared or soiled with grease or oil
"greasy coveralls"
"get rid of rubbish and oily rags"
Source: WordNet® (An amazing lexical database of English)
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