thinner
adjectiveUK /ˈθɪn.ər/
US /ˈθɪn.ɚ/
more thin than something else.
This book is thinner than that one.
OTHER MEANINGS
2. a liquid used to make paint or other substances less thick.
Add some thinner to the paint so it spreads easily.
3. a person who makes something thinner or removes extra parts.
The gardener is a thinner of overgrown branches.
4. less dense or less crowded.
The crowd grew thinner as the evening went on.