in a funk

in a (blue) funk

slang Feeling sad or unhappy for a lengthy period of time. Ever since I got rejected from my first-choice college, I've been in a funk. I'm taking Don out tonight because he's been in a blue funk since his wife left him.
See also: funk
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

in a (blue) funk

sad; depressed. I've been in a blue funk all week. Don't get in a funk about your job. Things'll get better.
See also: funk
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
Lop-Ear was plainly in a funk, and yet his conduct in remaining by me, in spite of his fear, I take as a foreshadowing of the altruism and comradeship that have helped make man the mightiest of the animals.