What is the abstract noun for still?

The abstract noun for "still" depends on the context. Here are some possibilities:

If "still" refers to a state of calmness or quiet:

* Quiet

* Silence

* Tranquility

* Peace

* Serenity

If "still" refers to a state of being motionless or unchanging:

* Stasis

* Immobility

* Inactivity

* Stationariness

If "still" refers to a point in time:

* Moment

* Instant

The best choice will depend on the specific meaning you want to convey.