infrequent
adj. B2 Upper Intermediate US //ˌɪnˈfɹikwənt// UK //ɪnfɹˈiːkwənt// in·fre·quent
adj. happening only a few times. You use this to describe something that does not occur often or regularly.
adj. occurring only occasionally or at long intervals. Often used to describe events or behaviors that are not common or regular.
The train runs infrequent on this line.
The company holds infrequent meetings to ensure that the team does not become overwhelmed by constant communication.
While the species was once common across the valley, it is now considered infrequent, with only a handful of sightings reported by researchers over the last decade.
From in- + frequent.