Webster's Revised Unabridged Dictionary · 1913

Unfrequent

Unfrequent ({not transcribed}) , adjective

[Prefix un- not + frequent.]

Infrequent. — J. H. Newman

Unfrequent , transitive verb

[1st pref. un- + frequent.]

To cease to frequent. [Obsolete]
They quit their thefts and unfrequent the fields. — J. Philips