Some Japanese words attach to a noun not with the modern な (静（しず）かな海）but with たる (堂々（どうどう）たる態度（たいど）) or なる (単（たん）なる噂（うわさ）). These endings look like relics because they are: たる and なる are the pre-noun (連体形, れんたいけい) forms of the classical copulas たり and なり, embedded unchanged in modern formal Japanese. The payoff of seeing them this way is that a word taking たる or なる is doing exactly what a な-adjective does — linking a quality to a noun — only in the older grammar's clothing. That is precisely why you cannot modernise them: 堂々な and 確固（かっこ）な are ungrammatical, because the ending is a frozen copula, not the swappable modern な.
Where these endings come from
Classical Japanese had two copulas that worked like adjectival-verb (形容動詞, けいようどうし) endings, each a fusion of a particle with the verb あり ("to be"):
- なり = に + あり. Its 連体形 (before a noun) is なる; its adverbial (連用形) is に.
- たり = と + あり. Its 連体形 is たる; its adverbial is と.
Modern な-adjectives are simply the なり copula with its ending eroded: 静かなる → 静かな, while the adverbial に never changed (静かに). Seen against that, 単なる and 聖（せい）なる are just な-adjectives that kept the full old ending なる instead of shortening it to な. And 堂々たる belongs to the parallel たり system, which never developed a modern な form at all — it stayed frozen, which is why its partner survives only as たる / と.
| Copula | Origin | Before a noun | Adverbially | Modern reflex |
|---|---|---|---|---|
| なり | に + あり | 〜なる (聖なる) | 〜に (単に) | な-adjective (静かな) |
| たり | と + あり | 〜たる (堂々たる) | 〜と (堂々と) | frozen — no な form |
The たる set: dignified, imposing, formal
The たり copula fused mostly onto two-character Sino-Japanese roots, often reduplicated, and the result rings with authority. This is the register of speeches, editorials, and formal reports.
| Word | Before a noun | Meaning |
|---|---|---|
| 堂々 (dōdō) | 堂々たる態度 | dignified, imposing |
| 確固 (kakko) | 確固たる信念 | firm, unshakeable |
| 断固 (danko) | 断固たる措置 | resolute, decisive |
| 燦然 (sanzen) | 燦然たる功績 | brilliant, resplendent |
| 錚々 (sōsō) | 錚々たる顔ぶれ | illustrious, distinguished |
| 歴然 (rekizen) | 歴然たる事実 | plain, unmistakable |
確固たる証拠がない限り、告発には踏み切れない。
kakko taru shōko ga nai kagiri, kokuhatsu ni wa fumikirenai
Without firm evidence, we can't go ahead with the charges.
式典には、各界の錚々たる顔ぶれが顔をそろえた。
shikiten ni wa, kakkai no sōsō taru kaobure ga kao o soroeta
An illustrious lineup from every field gathered for the ceremony.
首相は、テロに対して断固たる態度を示した。
shushō wa, tero ni taishite danko taru taido o shimeshita
The prime minister showed a resolute stance toward terrorism.
The adverbial partner と is where these words leak into ordinary speech: 堂々と歩（ある）く ("walk with poise"), 断固として反対（はんたい）する ("resolutely oppose"). Even where the たる form stays firmly literary, its と twin is heard everywhere.
彼女は聴衆の前で、堂々と自分の意見を述べた。
kanojo wa chōshū no mae de, dōdō to jibun no iken o nobeta
She stated her opinion before the audience with complete poise.
The なる set: mere, grand, holy
The なり copula's survivors are more varied and slip into everyday formal Japanese. 単なる alone you will meet constantly.
それは単なる偶然に過ぎない。深読みしすぎだよ。
sore wa tan naru gūzen ni suginai. fukayomi shisugi da yo
That's mere coincidence, nothing more. You're overthinking it.
大いなる期待を胸に、新入社員たちが入ってきた。
ōi naru kitai o mune ni, shinnyū shain-tachi ga haitte kita
The new hires came in with great expectations in their hearts.
聖なる夜、教会の鐘が街じゅうに鳴り響いた。
sei naru yoru, kyōkai no kane ga machijū ni narihibiita
On the holy night, the church bells rang out across the whole town.
いかなる理由があろうと、暴力は決して許されない。
ikanaru riyū ga arō to, bōryoku wa kesshite yurusarenai
Whatever the reason, violence can never be excused.
母なる大地の恵みに、あらためて感謝したい。
haha naru daichi no megumi ni, aratamete kansha shitai
I want to give fresh thanks for the blessings of mother earth.
Note the two workhorses. 単なる ("mere, nothing but") and its adverbial twin 単に ("simply, merely") are ordinary formal Japanese, not archaic flourishes. And いかなる ("what kind of, whatever") is the classical interrogative 如何（いか）なり — the literary sibling of どんな, standard in written and formal speech.
単に運が良かっただけで、実力ではありません。
tan ni un ga yokatta dake de, jitsuryoku de wa arimasen
I was simply lucky — it wasn't skill.
You will also meet the なる set standing proud in the titles of famous works, where its grandeur is exactly the point: 山崎豊子（やまざきとよこ）の『華麗なる一族（いちぞく）』("The Grand Family"), the Japanese title of Great Expectations 『大いなる遺産（いさん）』, and countless film subtitles built on 聖なる〜 or 母なる〜. Recognising なる as the frozen copula tells you at a glance that such a title means "the X-ish family / inheritance," a quality bestowed on the noun — not "a family that becomes" anything.
『華麗なる一族』は、昭和の企業社会を描いた名作だ。
karei naru ichizoku wa, shōwa no kigyō shakai o egaita meisaku da
『The Grand Family』 is a masterwork depicting the corporate society of the Showa era.
Watch the homophone: this なる is not the verb "become"
Modern Japanese has a very common verb なる ("to become"), and it looks identical to the copula's なる. They are different creatures. 聖なる山（やま）is "a holy mountain" (copula — a quality linked to a noun), not "a mountain that becomes." The copula なる sits before a noun and describes it; the verb なる ends a clause and reports a change. If a noun follows immediately, you have the copula.
彼はやがて偉大なる指導者になる。
kare wa yagate idai naru shidōsha ni naru
He will eventually become a great leader.
That one sentence holds both: 偉大なる指導者 (copula, "great leader") and …になる (verb, "become"). The verb sense gets its own treatment on the なる — become page.
A closed set: you memorise these, you don't build them
This is the crucial practical point. たる and なる are not productive — you cannot coin new ones. Because the ending is a fossil copula, not the live modern な, you may not swap in な (×堂々な, ×確固な, ×単な) and you cannot attach たる/なる to arbitrary nouns to sound formal. The inventory is fixed and short; learn it as a list of set literary attributives, the same way the 〜げ and たる-adjectives page treats them as frozen relics rather than a pattern to generate on the fly. When you need the "dignified" idea in speech, the safe modern escape hatch is とした: 堂々とした態度, 確固とした信念 — same meaning, no bookishness, no temptation toward the wrong な.
彼は確固とした信念を持って、その提案を退けた。
kare wa kakko to shita shinnen o motte, sono teian o shirizoketa
With firm conviction, he turned down the proposal.
Common mistakes
1. Modernising たる/なる into な. The ending is a frozen copula, so な is ungrammatical.
❌ 堂々な態度で会見に臨んだ。
Wrong — 堂々 takes the classical たる (or spoken とした), never な: 堂々たる態度 / 堂々とした態度.
✅ 堂々たる態度で会見に臨んだ。
dōdō taru taido de kaiken ni nozonda
He faced the press conference with a dignified bearing.
2. Using に for the たる adverbial. The たり copula's adverbial is と, not に.
❌ 彼は確固に反対の意を示した。
Wrong — the たり adverbial is と: 確固として / 断固として reject, not 確固に.
✅ 彼は断固として反対の意を示した。
kare wa danko to shite hantai no i o shimeshita
He resolutely made his opposition clear.
3. Inventing new たる/なる words. They're a closed set; you can't attach them freely to sound formal.
❌ 便利たるアプリを開発した。
Wrong — 便利 is a modern な-adjective (便利な), not a たる-word. たる can't be bolted onto any noun for formality.
✅ 便利なアプリを開発した。
benri na apuri o kaihatsu shita
They developed a convenient app.
4. Confusing copula なる with verb なる. Before a noun it describes; ending a clause it means "become."
❌ 単なる、彼は正しいと思う。
Wrong — 単なる must sit before a noun (単なる誤解). As a standalone adverb 'simply,' use 単に: 単に彼が正しいと思う.
✅ 単に、彼が正しいと思うだけだ。
tan ni, kare ga tadashii to omou dake da
I simply think he's right, that's all.
Key takeaways
- 〜たる and 〜なる are the pre-noun (連体形) forms of the classical copulas たり (と+あり) and なり (に+あり) — frozen into modern formal Japanese.
- A word taking たる/なる is grammatically parallel to a な-adjective (堂々たる ≈ 静かな), which is why it feels adjectival — but it's the old copula, so it refuses modern な.
- The たる set (堂々たる, 確固たる, 断固たる, 錚々たる) is dignified and literary; its adverbial と (堂々と, 断固として) leaks into speech.
- The なる set (単なる, 大いなる, 聖なる, いかなる, 母なる) is more everyday-formal; 単なる / 単に are ordinary written Japanese.
- These are a closed, memorised inventory — you cannot coin new ones or swap in な. For "dignified" in speech, use とした (堂々とした).
- Copula なる (聖なる山, before a noun) is not the verb なる ("become"); the verb ends a clause and reports a change.
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- なり / たり: The Classical CopulaBeyond — なり (に＋あり) and たり (と＋あり) are the full-length classical copulas that today's だ, である, and even the attributive な all shrank from — so learning them is meeting the ancestor of the everyday 'to be', not memorizing a relic.
- 〜げ and たる-AdjectivesN2 — Two register-marked adjective forms descended from older grammar — 〜げ ('seeming, giving an air of', 悲しげ, 得意げ, ありげ) and the classical たる-adjectives (堂々たる, 確固たる) that take たる before a noun and と adverbially.
- 〜くなる / 〜になる: BecomeN4 — How to express a change of state with なる — い-adjectives take 〜く, na-adjectives and nouns take 〜に, and the change is always something that happens by itself.