sporadic (adjective) sporadic: on and off
Detalii: periodic means happening or recurring at regular intervals; sporadic means occurring singly or occasionally or in scattered instances
Sinonime: bits and pieces,
desultory,
few, fitful, fits and starts, hit-or-miss, infrequent,
intermittent,
irregular,
isolated,
occasional, on-again-off-again,
random,
rare,
scarce,
scattered,
seldom, semioccasional, spasmodic, spotty,
uncommon, unfrequent
Antonime: constant,
continuous,
dependable