irregularly
adv. B2 Upper Intermediate US //ˌɪˈɹɛɡjəɫɝɫi// UK //ɪɹˈɛɡjuːləli// ir·reg·u·lar·ly
adv. in a way that is not regular or happens at different times. You use this when something does not follow a fixed pattern.
adv. in a manner that is not uniform, systematic, or predictable. Often describes the frequency or timing of an event.
The bus arrives irregularly because of the heavy rain.
The company sends out updates irregularly, so you should check the website every few days to stay informed.
While the initial data suggested a steady decline, the subsequent reports showed that the trend was actually occurring irregularly, with several months of stability followed by sudden spikes.
From irregular + -ly.