once in a blue moon

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 often not quite only only just perceptibly pretty near scantly slightly sparsely sporadically with trouble

frequently

very

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 not often off and on on occasion once and again once in a while once or twice sometimes

hardly infrequently periodically seldom sometimes sporadically

at intervals at random at times every so often from time to time irregularly now and again on occasion once in a while once or twice uncommonly

always constantly frequently regularly steadily usually

at intervals at times discontinuously every now and then every once in a while every so often from time to time hardly infrequently intermittently irregularly now and again now and then occasionally off and on on occasion once in a while periodically sometimes sporadically

at intervals at times every now and then every so often from time to time hardly infrequently irregularly now and again on occasion periodically rarely seldom sometimes sporadically

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 often not very often on and off once in a while scarcely ever semioccasionally uncommonly unoften unusually whimsically

frequently regularly

often usually

consistently constantly frequently occasionally

at intervals at times ever and again every so often from time to time here and there intermittently now and again now and then off and on on occasion once in a while periodically recurrently

never

intermittently now and then occasionally rarely seldom sparingly

hardly hardly ever little not regularly scarcely uncommonly unusually

frequently regularly usually