有恃无恐 fearless
Explanation
指因为有所依仗而毫不害怕，或毫无顾忌。形容人做事不考虑后果，毫无顾忌。
It refers to the fact that one relies on something and therefore has no fear or disregard. It describes someone who does something without considering the consequences and doesn't care about anything.
Origin Story
春秋时期，齐国和鲁国交界处发生了一场争端。齐孝公想称霸诸侯，他听说鲁国遭遇了严重的旱灾，国库空虚，百姓生活困苦，便认为鲁国软弱可欺，于是率兵攻打鲁国。鲁僖公派大臣展喜前去劝说齐孝公退兵。展喜来到齐国军营，面对气势汹汹的齐军，他并没有胆怯。他向齐孝公说道："大王，虽然鲁国现在国力衰弱，但我们仍然有恃无恐。我们依靠的是先王留下的遗训和祖宗的基业，这是我们立国的根本。"齐孝公听了展喜的话，仔细思考了一番，认为鲁国虽然衰弱，但他们依然有自己的底气和坚持。他想起鲁国先君的威名和鲁国的历史底蕴，最终决定罢兵退军。
During the Spring and Autumn period, a dispute arose between the states of Qi and Lu. The Duke of Qi, aiming to dominate the other feudal lords, learned that Lu had suffered a severe drought, leaving its treasury empty and its people impoverished. Believing Lu to be weak and easy to conquer, he led his troops to attack. The Duke of Lu sent his minister, Zhan Xi, to persuade the Duke of Qi to withdraw. Zhan Xi arrived at the Qi army camp and, facing the menacing Qi forces, showed no fear. He addressed the Duke of Qi, saying, "Your Majesty, though Lu is currently weak, we remain confident. Our confidence rests on the legacy of our past rulers and the foundation built by our ancestors—this is the cornerstone of our state."
Usage
常用于形容人因有所依靠而无所畏惧，或指人盲目自信，不考虑后果。
Often used to describe someone who is fearless because of their reliance on something, or to describe someone who is blindly confident and doesn't consider the consequences.
Examples
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他总是如此有恃无恐，完全不考虑后果。
tā zǒngshì rúcǐ yǒushì wúkǒng, wánquán bù kǎolǜ hòuguǒ
He is always so confident, without considering the consequences.
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仗着家里的权势，他一直有恃无恐，无法无天。
zhàngzhe jiā lǐ de quán shì, tā yīzhí yǒushì wúkǒng, wúfǎ wútiān
Relying on his family's power, he has always been fearless and lawless.