IPA: /ˈɡriːziəst/
KK: /ˈɡriːziɪst/
The most oily or covered in grease; having a lot of fat or oil.
The greasiest food I ever ate was a deep-fried burger.
Comparative: greasier
Superlative: greasiest
Greasiest → It is formed from "grease" (from Old French *graisse*, meaning fatty substance) and the superlative suffix "-iest" (meaning most). The word "greasiest" means having the most grease or being the most oily.
Think of 'grease' as a fatty substance, and remember that 'greasiest' means having the most grease.