Which kind of parts of speech is 'Sporadic'?

• Sporadic (adjective)
English Meaning: Not happening or appearing in a pattern; not continuous or regular.
Bangla Meaning: এখানে-সেখানে বা মাঝে মাঝে ঘটে কিংবা দেখা যায় এমন; বিক্ষিপ্ত: sporadic firing.

Example Sentence:
1. Later, our contact became more sporadic but we still had occasion to work together every once in a while.
2. Sporadic cases of the disease were reported.

Source: Website Lecture.