associated by chance and not an integral part; "poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson; "they had to decide whether his misconduct was adventitious or the result of a flaw in his character"欠くことのできない部分ではなく、たまたま結びついた外来性
例:They had to decide whether his misconduct was adventitious or the result of a flaw in his character. 彼らは、彼の不正行為が偶然であるか、彼の性格の欠陥の結果であったかどうか決めなければならなかった。