(adv.) In an occasional manner; on occasion; at times, as convenience requires or opportunity offers; not regularly.

at infrequent intervals at intervals at odd times at times at various times betweentimes betweenwhiles brokenly by catches by fits by jerks by skips by snatches disconnectedly discontinuously every so often fitfully haphazardly here and there in spots infrequently intermittently irregularly now and then off and on on divers occasions on occasion once and again only occasionally only when necessary per saltum periodically randomly skippingly sometimes sporadically uncommonly willy-nilly