at haphazard
at intervals
at irregular intervals
at random
brokenly
by catches
by chance
by fits
by jerks
by snatches
capriciously
carelessly
chaotically
choppily
desultorily
disconnectedly
discontinuously
eccentrically
erratically
every which way
fitfully
haltingly
haphazardly
helter-skelter
higgledy-piggledy
hit or miss
impulsively
in snatches
in spots
in the rough
inconsistently
inconstantly
indiscriminately
infrequently
intermittently
jaggedly
jerkily
lurchingly
nonuniformly
off and on
on
patchily
promiscuously
raggedly
randomly
rough
roughly
sloppily
spasmodically
sporadically
regularly