in·fre·quent /(ˌ)ɪnˈfrikwənt/
(a.)稀少的,珍貴的,罕見的
In·fre·quent a. Seldom happening or occurring; rare; uncommon; unusual.
The act whereof is at this day infrequent or out of use
among all sorts of men. --Sir T. Elyot.
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infrequent
adj : not frequent; not occurring regularly or at short intervals;
"infrequent outbursts of temper" [ant: frequent]