Slim, skinny, slender.
The word 'obese' is not a verb; obese is an adjective, a word to describe a noun: an obese budget, an obesedog, etc.The noun form for the adjective obese is obeseness. A related noun form is obesity.
My grandmother is really obese. ( fat ).
That would probably mean being obese.
The exact opposite. Children with Progeria are extremely skinny.
Obese
obviously
fat, cat
Another word for fat with 5 letters would be Obese. or over-the-top-horribly-obese
Obese
Obese
obese
Basically to be more fit. To be lean is the opposite of being fat or obese.