at irregular intervals
at random
brokenly
by catches
by fits
by jerks
by snatches
capriciously
chaotically
choppily
desultorily
disconnectedly
discontinuously
disparately
disproportionately
eccentrically
erratically
every which way
fitfully
haltingly
haphazardly
helter-skelter
higgledy-piggledy
impulsively
in snatches
in spots
in the rough
inconsistently
inconstantly
indefensibly
inexcusably
inexpiably
iniquitously
interestedly
intermittently
irregularly
irremissibly
jaggedly
jerkily
lurchingly
nonuniformly
off and on
one-sidedly
partially
patchily
raggedly
rough
roughly
spasmodically
sporadically
evenly