The phrase "more irregularly" can be replaced with words like sporadically, infrequently, unexpectedly, unpredictably, haphazardly, and intermittently to name a few. These synonyms express actions or events that occur at different intervals or patterns. Sporadically means occurring irregularly or at widely spaced intervals; infrequently means happening rarely or not occurring often; unexpectedly means happening without warning or being prepared for it; unpredictably means happening in an erratic or unreliable manner; haphazardly means happening by chance or randomly; and intermittently means occurring at irregular intervals. The use of these synonyms can add variety to a sentence or aid in conveying a particular meaning.