Depression
Melancholy, Dejection, Gloom
noun, な adjective
With lots of grief and gloom in your life you'll probably end up in a spiral of depression. Don't worry, you'll be okay. Things get better with time so don't give into the gloom.
ゆううつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
会社へ出勤するのが憂鬱です。
Working at a company is depressing.