the.com/enjoyment
The pleasure you only notice once it's quietly slipping away.
means The state of taking active pleasure or satisfaction from something, while it's happening.
from From Old French enjoir, to rejoice, built on joie (joy) — literally putting yourself into joy.
Legal senseMeans possessing and using property, not having fun.
Active verbTo enjoy is to do, not just feel.
Hedonic treadmillBrains dull enjoyment fast to chase the next hit.