adj .
accidental ; occurring by chance 우연한 ; 우연히 일어나는

• The program's outcome was not the result of any plan but was entirely _____.
• The object was so perfectly formed that its creation could not have been _____.
• _____ is often misused to mean lucky or serendipitous. Don't make that same mistake. It means merely accidental.
  _____ 를 행운이나 뜻밖의 발견이라는 뜻으로 사용하는 실수를 자주 범한다. 그런 실수를 하지 말라. 이 단어는 단지 '우연한'이라는 뜻을 갖고 있을 뿐이다.