How to say "necessarily" in Japanese

• 必ずかならずJLPT N4approx.Common
  adverbCovers 'necessarily' in the sense 'without exception, certainly': the common adverb for something bound to happen every time or a result certain to follow, as in promises, warnings, and rules.
  あの歌うたは必かならずヒットするよ。↗

  That song's bound to be a hit.
• 余儀なくよぎなくCommon
  adverbCovers 'necessarily' as 'unavoidably, inevitably', when circumstances rather than logic force an outcome; it typically appears in set expressions saying something was forced or made unavoidable by events.

Use 「必ず」 for 'necessarily' meaning 'without exception, certainly' — something is bound to happen every time; use 「余儀なく」 when circumstances unavoidably force an outcome, typically in expressions about being compelled.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 必ずかならずalways
• 余儀なくよぎなくunavoidably
• やむを得ずやむをえずunavoidably
• 余業無くよぎょうなくunavoidably
• やむえずunavoidably
• 勢いいきおいnaturally