Origins
From Penelope (Odyssey), associated with the daily act of weaving that continues regardless of mood or outcome, blended with lento (Italian for slow, steady tempo in music).
Meaning
Penelento is the sour feeling that shows up after a genuinely good day, when we realize there is no final release coming.
A good day should feel like a conclusion, and instead it feels like a clean page that will need to be written again tomorrow. We resent the quiet cost of steadiness. We want a dramatic payoff that would let us stop.
What we get is the same simple assignment. Keep going.
Usage
I had a great day, then Penelento hit when I realized tomorrow still asks for the same effort.
Penelento is wanting a payoff, and getting another ordinary day instead.
When Penelento shows up, I try to treat steadiness like success, not a sentence.