From Longman Dictionary of Contemporary Englishtomfoolerytom‧fool‧e‧ry /tɒmˈfuːləri $ tɑːm-/ noun [uncountable] old-fashioned STUPID/NOT SENSIBLEsilly behaviour
Examples from the Corpus
tomfoolery• A brief summary is in order for those of you not inclined to keep track of shenanigans and other assorted tomfoolery.• Let's not have any more tomfoolery with your feelings.• All it took was nerve, organization and terminal tomfoolery.• What if I stopped that tomfoolery? 