on-again-off-again

desultory intermittent periodic spotty

bits and pieces broken capricious catchy changeable disturbed erratic flickering fluctuating haphazard herky-jerky hit-or-miss impulsive inconstant interrupted random recurrent restive restless shifting spasmodic spastic unstable variable

constant continual regular

continuous even undisturbed unvarying

annual intermittent monthly occasional recurrent recurring regular repeated routine seasonal sporadic weekly yearly

periodical

alternate at various times centennial cyclic cyclical daily epochal every once in a while every so often fluctuating hourly infrequent isochronal isochronous on certain occasions orbital perennial rhythmic serial spasmodic

constant infrequent unusual

continual irregular lasting permanent sporadic variable

bits and pieces changeable choppy convulsive desultory fitful fits and starts intermittent irregular jerky periodic shaky spastic sporadic spotty spurtive uncertain

resting uninterrupted

desultory fitful infrequent intermittent irregular isolated occasional random rare scattered spotty

bits and pieces few fits and starts hit-or-miss scarce seldom semioccasional spasmodic uncommon unfrequent

common constant even frequent methodical regular systematic usual

continuous dependable

erratic patchy sporadic uneven

desultory flickering fluctuating not uniform pimply spasmodic unequal

consistent continuous dependable regular

constant unbroken