many trees

to cover / to cover up, to conceal, to hide / to permeate, to spread throughout / to include everything

forest

depressing / depressed

depression, gloom, melancholy

dense (growth); lush; luxuriant / accumulate; stagnate / depression; gloom; melancholy

(psychiatry) depression

a forest (dense collection of trees) / a shrine grove

forest, woods / objects lined up / silent

conceal, cover up