Answer: sporadic

AnswerCrossword Clue
SPORADIC

Off and on

SPORADIC

On-again, off-again

SPORADIC

Occurring irregularly

SPORADIC
Not steady
SPORADIC
Scattered
SPORADICNow and again.
SPORADICOccasional
SPORADICOn and off
SPORADICIsolated
SPORADICNot regular
SPORADICOn-again-off-again
SPORADICIrregular