Webster's Revised Unabridged Dictionary · 1913

Infrequence

Infrequence , noun

[Latin infrequentia scantiness: compare French infrequence.]

1.
The state of rarely occuring; uncommonness; rareness; as, the infrequence of his visits.
2.
The state of not being frequented; solitude; isolation; retirement; seclusion. [Rare]
The solitude and infrequency of the place. — Bp. Hall

Also: Infrequency