← BackshareGuessidiotism/ˈɪdiəˌtɪzəm/nounA foolish or stupid action, remark, or behavior.I can't believe she said that—what an idiotism!His constant idiotisms at work cost him the promotion.The politician's speech was full of idiotisms that made the audience laugh.SynonymsfollystupidityAntonymswisdomsense