Definitions

1. adjective

comparative form of skinny: thinner; less plump or corpulent

“After a few months of exercising, she started to look skinnier.”

2. adverb

used to compare two things, especially in relation to their size, especially the comparison of the size of something, especially a person or an animal

“He looked skinnier than his brother.”

3. noun

a person or thing that is skinnier

“She’s one of the skinnier girls in the class.”