A German Federal Police officer escorts a group of migrants who irregularly crossed the border from Poland into Germany during a patrol in a forest near Forst, southeast of Berlin, Oct. 11, 2023.

Source: https://www.csmonitor.com/World/Europe/2023/1012/Germany-steps-up-deportations-as-migration-pressure-increases?icid=rss

I never went to Sunday Mass. My family went, irregularly, to the Protestant church on campus, which had Sunday school.

Source: https://cebudailynews.inquirer.net/499967/answering-my-own-question

The Director of Mental Health said that more suicides had taken place in Gampaha and Kurunegala Districts while suicides in the Gampaha District had increased irregularly last year.

Source: https://www.onlanka.com/news/over-3400-suicides-reported-in-sri-lanka-in-2022.html

The third category is migrants who are employed in the country irregularly.

Source: https://punchng.com/greener-pastures-desperate-youths-reap-uncertainty-frustration-over-illegal-migration/