I looked up inane
The dictionary app basically said,

Silly

A derivative was listed as inanity
So I surmised this must mean the act of being

Silly

This came up a few days ago
My stepson asking me if I remembered the one time I was

Silly

Insight from the youngish set
Profiling my inability to act with

Inanity

Which isn’t exactly true
For I can laugh at myself and the world

Sensibly

When the humor is funny
And not vacuous like those stricken with intellectual

Inanity

Thanks little man for bringing the laughs
And telling me to my face that I need to be more

Silly