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

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

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