Duncery is an old-fashioned term that refers to foolishness or stupidity. There are many synonyms for this word, all of which may be used to describe someone who acts in a foolish or unintelligent manner. Some synonyms for duncery include idiocy, ignorance, silliness, absurdity, buffoonery, and clownishness. Other similar words could include dim-wittedness, foolish behavior, or mindlessness. These words can be used interchangeably to describe people who exhibit these types of behaviors. Whether you are trying to describe someone who is acting foolishly or simply want to expand your vocabulary, incorporating these synonyms for duncery into your writing can be beneficial.