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A point in life where the person just doesn't care anymore about living or dying. The reasons for not caring anymore could be anything. Whether it's because of some fatal disease to depression to just being unhappy with oneself.
"He's in such a state of felth that no matter what good comes his way, he'll just brush it off"

"Ever since losing his wife, he's been feeling felthocious"
by Goatmetal October 14, 2007