Something that occurs irregularly or not at regular intervals.

A publication that is not released at regular intervals.

जो समय-समय पर नहीं निकलती

English Usage: The aperiodical journal featured articles on various scientific topics.

Hindi Usage: अनियमित जर्नल में विभिन्न वैज्ञानिक विषयों पर लेख प्रकाशित किए गए।