Gloom
Depression
A tree can be a tree, but it can also be a psychopath. The tree goes from being a regular tree to being a psychopath. Such mood swings are so rough. Especially when the tree slips to gloom.
うつ
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Then the tree switches from gloom to being super excited (these moodswings!). The super excited tree starts doing dubstep. Uts (うつ) uts uts uts uts ♬.