How to say "secondary" in Japanese

• 二の次にのつぎCommon
  expression, no-adjectiveCovers 'secondary' in the sense of being of secondary importance or taking a back seat; it is a noun phrase used chiefly in the pattern 二の次 with だ or verbs meaning to treat something as less important.
  こーゆーのは、買かうのが楽たのしいのよ。使つかうか使つかわないかなんてのは、二の次にのつぎなんだって。↗

  This sort of thing, it's buying stuff that's fun. Whether you use it or not is secondary.
• 副次的ふくじてきCommon
  na-adjectiveUsed for things that are secondary or subordinate to something primary, such as secondary benefits or effects; it presents the matter as accompanying a more important main thing, in a somewhat formal written register.
• 二次的にじてきCommon
  na-adjectiveDescribes something as secondary or derivative in character, arising from or following on a primary thing, such as secondary consequences or secondary damage; close to 副次的 but emphasizes derivation rather than subordination.
  社会的しゃかいてきな関わり合かかわりあいは、この仕事しごとには二に次じ的てきなのです。↗

  Social relationships are secondary to this business.
• 付帯ふたいCommon
  suru verb, intransitive verb, no-adjectiveMeans incidental or ancillary: something that attaches to and accompanies a main thing rather than being central; its gloss 'secondary' is marginal, and it usually appears in formal contexts for accessory or accompanying matters.
• 二次にじCommon
  prenominal modifierAn ordinal or technical 'secondary' meaning second in a series or stage, as in secondary treatment or secondary infection; it is a bare noun and rarely conveys the sense 'of lesser importance', so it is seldom the word you want for that meaning.
  この本ほんは主おもに二に次じ喫煙きつえんの影響えいきょうについて書かいてある。↗

  This book is chiefly concerned with the effects of secondhand smoking.

Choose by sense: importance (「二の次」), secondary/derivative character (副次的, 二次的), incidental accompaniment (付帯), or ordinal/technical 'secondary' in expressions like secondary action (二次).

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

• 二の次にのつぎsecondary
• 副次的ふくじてきsecondary
• 二次的にじてきsecondary
• 付帯ふたいincidental
• セカンダリーsecondary
• 従じゅうsubordinate
• 二義的にぎてきsecondary
• 次列じれつsecondary (feathers)
• 二次性にじせいsecondary
• 二級にきゅうsecond grade
• 派生的はせいてきderivative
• 付帯的ふたいてきincidental
• 従的じゅうてきsubordinate
• 従たるじゅうたるsubordinate
• 二次にじsecondary