Having no other choice, he left the place.
cannot be helped; unavoidable; nothing one can do
Mixed kana-kanji spelling; the most common written form for this word.
Ateji spelling; rarely used in modern writing.
Rarely used kanji form.
The historical derivation is uncertain. The kanji 詮 is ateji, and 為ん方 is a rarely used kanji form. The word is conventionally associated with the meaning 'way' or 'method'.