accidental /ˌæksəˈdɛntl̟/ adjective Learner's definition of ACCIDENTAL
: happening in a way that is not planned or intended : happening by accident偶然的；意外的 : happening as an accident意外的 — accidentally
/ˌæksəˈdɛntl̟i/ adverb -
He accidentally deleted the file.他不小心删除了那份文件。
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The lock prevents the gate from opening accidentally.这把锁能防止大门意外打开。
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Did it happen accidentally [=by accident] or intentionally?那是个意外还是有人故意这么做的？
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He bumped into her accidentally on purpose. [=he bumped into her on purpose but he tried to make it appear to be an accident]他假装偶然遇到了她。