IPA: /ɪˈrɛɡjʊlərli/
KK: /ɪˈrɛɡjʊlərli/
In a way that does not follow a regular pattern or order.
The meetings are scheduled irregularly, making it hard to keep track of them.
Irregularly → It is formed from "ir-" (meaning not) and "regular" (from Latin "regulare", meaning to rule or govern) and the suffix "-ly" (meaning in a manner). The word "irregularly" means in a manner that is not governed by rules or standards.
Think of 'not' ('ir-') following rules ('regular') — that's why irregularly means not following the usual rules.