偶然

Adjective

 * 1) accidental; coincidental; by chance; random; fortuitous

Adverb

 * 1) accidentally; coincidentally; by chance; fortuitously
 * 2) occasionally; randomly
 * 1) occasionally; randomly

Adjective

 * 1) contingent, casual, accidental, incidental
 * inevitable
 * impossible

Adverb

 * 1) by chance, incidentally

Synonyms

 * たまたま

Antonyms

 * 必ず (inevitably)

Noun

 * 1) chance, contingency