How to say "long-term" in Japanese

• 長期ちょうきJLPT N3approx.Common
  no-adjectiveA noun for a long stretch of time. Choose it when 'long-term' points to the duration itself — how long something lasts, as with stays, plans, or contracts — rather than to a quality of something.
  長期ちょうきにわたる病気びょうきのあとでジェーンはカウチ・ポテトになった。↗

  After being ill for a long time, Jane turned into a couch potato.
• 長期的ちょうきてきCommon
  na-adjectiveAn adjective treating 'long-term' as a characteristic: it describes something as long-term in nature — a perspective, effect, or trend — and also works adverbially in the sense 'over the long term'.
  経営けいえい陣じんは収益しゅうえきの短期的たんきてき改善かいぜんに気きを取とられすぎて、長期的ちょうきてきな将来しょうらい計画けいかくに気きが回まわらない傾向けいこうがあった。↗

  The management tended to be too concerned about short-term improvement of the bottom line to have any long-term design for the future.

Both words mean 'long-term': use the noun 長期 when naming the long stretch of time itself, as in durations or plans, and the adjective 長期的 when describing something as long-term in character.

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

• 長期ちょうきlong-term
• 長期的ちょうきてきlong-term