説|せつsetsu[1]atamadaka (head-high)

1. noun, noun (suffix)theory; doctrine
   あなたがなんと言いおうと、私はやはりその説せつが正ただしいと思おもう。↗

   For all you say, I still believe in the truth of the theory.
2. nounopinion; view
3. nounrumour; rumor; gossip; hearsay

• SynonymセオリーNeutralA loanword for theory, but also the standard or accepted way of doing things, as in 「セオリー通り」; 「説」 is a view or doctrine, not a playbook.
• Synonym理論りろんWrittenA systematic, organized body of theory, as in 「理論と実践」; 「説」 is a single view that has not been verified.
• Synonym学説がくせつWrittenAn academic view put forward by a scholar; 「説」 is broader, covering views in general and even rumours.
• Related理屈りくつCasualColloquial: logic or reasoning, often strained, quibbling logic used as an excuse; 「説」 is a view or doctrine.
• Related原理げんりWrittenA fundamental principle underlying many things, as in 「てこの原理」; more established and certain than 「説」.

Use 「説」 for a view, doctrine, or unverified claim, and for rumours; it often works as a suffix, as in 「新説」. For a systematic theory use 「理論」, for scholarly academic views 「学説」, for basic principles 「原理」, and for strained or quibbling logic 「理屈」.

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

1. （セツ）ある主題しゅだい、特とくに学術がくじゅつ理論りろんに対たいする確証かくしょうを経へていない見解けんかい。
2. （セツ）見解けんかい。憶測おくそく。うわさ。