infrequent

infrequent, uncommon, scarce, rare, sporadic mean not common or abundant. infrequent implies occurrence at wide intervals in space or time <infrequent family visits>. uncommon suggests a frequency below normal expectation <smallpox is now uncommon in many countries>. scarce implies falling short of a standard or required abundance <jobs were scarce during the Depression>. rare suggests extreme scarcity or infrequency and often implies consequent high value <rare first editions>. sporadic implies occurrence in scattered instances or isolated outbursts <sporadic cases of influenza>.