Of or having little to no substance, whereas there was substance before; lacking courage, spineless, with little nerve. One who, once hardened to life's circumstances, now breaks easily under pressure.

Usually use in reference to a person who has recently become a shell of a former self, for whatever reason.
"After Andy's marriage dissolved, he found himself yolkless."

"C'mon, get out of the house for once. You're starting to get yolkless."
by A.J. McLugh July 4, 2019
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