infrequently
adv.happening only a few times. You use this to describe something that does not occur often.
adv.occurring only a few times; not often. Typically used to describe the frequency of an action or event.
“The bus runs infrequently on this route.”
“The two old friends met infrequently, but every time they did, they spent the entire day together.”
“While the species was once common across the valley, it now appears infrequently, likely due to the rapid urbanisation of the surrounding areas.”
Usage infrequently occur
“Existing weather and Earth-observing satellites can detect large fires, but they often lack the resolution or revisit the same location too infrequently to spot small fires shortly after they ignite.”
“Total eclipses offer a natural laboratory for viewing the corona, but because they don’t last long and happen relatively infrequently, some scientists have started making artificial eclipses with a double-satellite formation.”
From infrequent + -ly or in- + frequently.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.