There are several synonyms for the phrase "wanton foolishness." Some examples include recklessness, thoughtlessness, carelessness, imprudence, and folly. Recklessness implies a disregard for consequences, while thoughtlessness suggests a lack of consideration for others. Carelessness suggests a lack of attention or effort, while imprudence denotes a lack of judgment or wisdom. Folly implies a lack of good sense or understanding. All of these terms convey similar meanings to wanton foolishness and can be used interchangeably in various contexts. Whether describing behavior or decisions, each of these synonyms carries a negative connotation and suggests a certain level of irresponsibility or recklessness.