Question

accidental

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ac∙ci∙den∙tal / ˌæksəˈdɛntl ; ˌæksəˈdentl /
◙adj
1. happening without being planned or intended
• 偶然的，意外的;
【OPP】 deliberate
 »an accidental discharge of toxic waste
  有毒废料的意外泄漏
 »Buy an insurance policy that coversaccidental damage.
  购买一份意外损害保单。
♦accidentallyadv:
 »I accidentally locked myself out of the house.
  我不小心把自己锁在了门外。