Sporadic

a.

1.

Occurring singly, or apart from other things of the same kind, or in scattered instances; separate; single; as, a sporadic fireball; a sporadic case of disease; a sporadic example of a flower. Sporadic disease (Med.) a disease which occurs in single and scattered cases. See the Note under Endemic, a.

Adj.

1.

sporadic - recurring in scattered and irregular or unpredictable instances; "a city subjected to sporadic bombing raids" Antonyms: continual - seemingly without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series; "the continual banging of the shutters"

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