not often

ever so often every now and then every once in a while infrequently now and again occasionally once and again once in a while periodically sometimes sporadically

barely comparatively practically rarely seldom simply somewhat

just

almost inconceivably almost not by a hair by no means detectably faintly gradually imperceptibly infrequently little no more than no way not a bit not at all not by much not likely not markedly not measurably not much not notably not noticeably not quite once in a blue moon only only just perceptibly pretty near scantly slightly sparsely sporadically with trouble

frequently

very

a little barely hardly rarely seldom

hardly ever not many not quite only just scarcely somewhat

frequently

more much

every now and then every so often infrequently intermittently now and again occasionally periodically sporadically

at intervals at times every once in a while from time to time hardly irregularly off and on on occasion once and again once in a blue moon once in a while once or twice sometimes

alternately at irregular intervals fluctuating hardly infrequently intermittent irregularly on and off scarcely sometimes sporadically vacillating variable very seldom when the mood strikes

alternately at irregular intervals fluctuating inconstantly infrequently intermittently irregularly now and then off and on sometimes sporadically uncertainly variable very seldom when the mood strikes

a few times hardly occasionally rarely scarcely sometimes sporadically

every now and then from time to time hardly ever in a few cases inhabitually irregularly little not very often on and off once in a blue moon once in a while scarcely ever semioccasionally uncommonly unoften unusually whimsically

frequently regularly

often usually

exceptionally extremely remarkably strangely unusually

extra hardly ever in few instances irregularly now and then occasionally oddly on occasion particularly peculiarly rarely scarcely ever seldom sporadically very

normally usually

commonly frequently