Definitions

1. verb

to remove or reduce the thickness of (something, especially trees or hair)

“The forester decided to unthinned the forest to preserve its biodiversity.”

2. noun

something from which the thickness has been removed, especially trees or hair

“The unthinned branches of the tree made it difficult to navigate through the forest.”

3. adjective

not thinned; not having the thickness removed

“The unthinned trees were preserved in the ancient forest.”