adverb
unavoidably; inevitably; reluctantly
Expresses that something cannot be helped and must be done, often with a sense of reluctance. Equivalent to 止むを得ず, but this is a contracted form.
See also: 止むを得ず
やむ得ず欠席する場合は、事前に連絡してください。
If you unavoidably must be absent, please contact us in advance.
雨で試合が中止になり、やむ得ず帰宅した。
The game was canceled due to rain, so I reluctantly went home.
The full, standard form meaning 'unavoidably'; やむ得ず is a contracted variant with the same meaning but less formal.
Contracted form of 止むを得ず (yamu o ezu), literally 'without being able to stop'. The kanji 止む means 'to stop', and 得ず is the negative of 得る (to get/be able).