seldom, scarcely, not habitually, not regularly, occasionally, uncommonly, sparingly, now and then, sporadically, intermittently, rarely, unusually, hardly ever; see also seldom.
"infrequently." YourDictionary, n.d. Web. 17 October 2018. <http://thesaurus.yourdictionary.com/Infrequently>.
infrequently. (n.d.). Retrieved October 17th, 2018, from http://thesaurus.yourdictionary.com/Infrequently
At rare intervals:
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