If you describe someone or their words or ideas as iconoclastic, you mean that they contradict established beliefs.
例句
Is it utopian to hope that such iconoclastic ideas will gain ground?...希望如此有悖傳統觀念的思想會發展普及，這是不是太理想化了？His iconoclastic tendencies can get him into trouble.他與傳統信仰相悖的思想傾向可能會給他帶來麻煩。
英英詞典釋義
Adjective
1. characterized by attack on established beliefs or institutions