[ʌn'fri:kwәnt]
adj.
不常发生的,不常见的

Unfrequent \Un*fre"quent\, a. [Pref. un- not + frequent.]
Infrequent. --J. H. Newman. -- {Un*fre"quent*ly} adv.


Unfrequent \Un`fre*quent"\, v. t. [1st pref. un- + frequent.]
To cease to frequent. [Obs.]

They quit their thefts and unfrequent the fields. --J.
Philips.