稀少;罕有
Infrequence \In*fre"quence\, Infrequency \In*fre"quen*cy\, n. [L. infrequentia scantiness : cf. F. infrequence.] 1. The state of rarely occuring; uncommonness; rareness; as, the infrquence of his visits. 2. The state of not being frequented; solitude; isolation; retirement; seclusion. [R.] The solitude and infrequency of the place. --Bp. Hall.