Definitions

1. adjective

the most slender or thin of a group of things; having the least amount of flesh or body

“She thought the skinniest model on the runway was the most striking.”

2. comparative

comparing two things, with the first being thinner or slimmer than the second

“He’s the skinniest kid in the class, but still manages to run fast.”

3. superlative

comparing three or more things, with the one being the thinnest or slimmest

“He’s the skinniest person I’ve ever seen, but still manages to eat a whole pizza by himself.”