謹厳|きんげんkingen[0]heiban (flat)

1. na-adjective, nounstern; grave; solemn; sobersided

• Synonym真面目まじめNeutralThe everyday word for earnest and honest; lighter than 「謹厳」, with none of its stern, stiff air.
• Synonym厳かおごそかWrittenWritten word for the solemn air of a ceremony or occasion; not used for a person's character.
• SynonymしかつめらしいCasualColloquial for being prim and stiffly formal — serious to the point of excess, often with a teasing tone.
• SynonymいかめしいNeutralDescribes a stern, imposing look that keeps people at a distance, as in 「厳めしい顔」; about appearance, not character.
• Synonym生真面目きまじめCasualColloquial for earnestness taken too far — rigid, inflexible, unable to bend.
• RelatedシリアスCasualLoanword for serious; covers both a work's atmosphere and a person's attitude. Strongly colloquial, while 「謹厳」 is written and describes strict conduct.
• Related真摯しんしWrittenWritten word for a sincere, wholehearted attitude, as in 「真摯に受け止める」; stresses sincerity rather than sternness.
• Related本気ほんきNeutralBeing in earnest rather than joking; about genuine intent, not a stern character.
• Related真剣しんけんNeutralSerious in the sense of fully absorbed and giving one's all to what one does.
• Related摯実しじつWrittenRare written word for sincere and honest; stresses genuine, wholehearted earnestness.
• Antonym軽薄けいはくWrittenWritten antonym: frivolous and careless in word and deed — the opposite of 「謹厳」's strictness.
• Antonym不真面目ふまじめNeutralAntonym: not serious — slapdash and lax, the opposite of 「謹厳」's disciplined rigor.

Use 「謹厳」 for someone cautious, stern and scrupulous, often as 「謹厳実直」. Everyday earnestness is 「真面目」; rigid over-seriousness 「生真面目」; a solemn ceremony 「厳か」. The opposite is 「軽薄」.

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

1. 慎み深つつしみぶかく、厳格げんかくなこと。また、そのようなさま。