Fatigate

[Sarah]

Wearied; tired; fatigued. [Obs.]Requickened what in flesh was fatigate. Shak.

[Sarah]

A word used to describe someone who is acting sad, dark, or melancholy.
A feeling of sadness or existentialism lying somewhere between the writings of Edgar Allen Poe and that episode of Futurama with Seymour the dog.