悪循環[akujunkan] vicious circle
因循[injun] indecision
因循姑息[injunkosoku] dilly-dallying and temporizing (temporising)
血液循環[ketsuekijunkan] blood circulation
再循環[saijunkan] recycle

循環[junkan] circulation
循良[junryou] good and obedient
循環小数[junkanshousuu] recurring decimal
循環系[junkankei] circulatory system (blood, lymph, etc.)
循環器[junkanki] circulatory organ