I need a existing word or neologism X meaning something like "robustness of appetite for life". Kinda like how:productivity::why: ______. The meta word for appetite.
My first clumsy shot is "appetivity". Usage like "How to increase your appetivity"
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"Meaningness" is definitely complementary/related though unclear how. I don't think increasing meaningness of an activity will have a simple relationship to increasing/lowering appetivity.

