Here are some synonyms for sporadic:
* Occasional
* Infrequent
* Intermittent
* Scattered
* Isolated
* Random
Examples:
* "The town experienced sporadic outbreaks of violence."
* "There were sporadic reports of gunfire in the area."
* "The artist's work is characterized by sporadic bursts of creativity."
In contrast to sporadic, something that is frequent or consistent happens regularly or often.