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> 今年の欧州マイル路線では古馬や牡馬を交えても **断然の** ＮＯ・１  
>  At this year's European Mile route, even with other types of horses
> participating, (アルファセントーリ) is the absolute number one

I know that 断然 is a taru adjective so shouldn't it be 断然たるＮＯ・１ instead? Is 断然
a noun or an adjective here? if it's an adjectives, can I use other taru
adjective with の instead of たる, like if they were の-adjectives? (I guess to
not sound very strict/archaic)

Other sentences I found:

>   1. 現時点で **断然の** １番人気になりそうなのはアイルランドの３歳牝馬アルファセントーリです。
>
>   2. 全点に撥水加工を施したemuは、他ブランドに比べても **断然の** 撥水性を保っています！
>
>   3. 私はずいぶん昔にBBTの単科科目を履修したことがあるのですが、その時に比べても **断然の** パワーアップ！！
>
>
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2019-01-10T05:34:38.013
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question
particle-の adjectives
Usage of 断然 as の-adjective?
Your question made me curious so I looked it up on a few different Japanese
online dictionaries. 断然 has two different forms, the adjective (形容動詞) form and
the adverb (副詞) form. The meanings depend on the form.

The adjective form, the と or たる form, refers to one's attitude of being
uncompromising in the face of strong opposition.

The adverb form refers to being on a completely different level compared to
others. You can use の(断然 **の** 1番) or な(断然 **な** 1番) with it, or just have no
particle at all, i.e.「ほかの店より **断然** 美味しい」.

So in your example, 断然の1番 refers to being "number 1 by far" and is being used
in its adverbial form.
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2019-01-10T06:46:48.673
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Personally, I use it only as a standalone adverb meaning "by a huge margin" or
"definitely (better)" when comparing things. That is to say, I usually use it
with 方が/より, and I almost never attach の/な/に to 断然.

Regarding its no-/na-adjectival usage, I can find a few examples on BCCWJ, so
it may not be entirely incorrect. But the number is very small as compared to
its adverbial usage (i.e., no の/な/に at all), and I personally wouldn't
recommend it.

>   * ダイビングやシュノーケルなら、バリより **断然に** 沖縄の離島が最高にきれいですよ。
>   * 愛用してると以前に比べると疲れ具合が **断然に** 違ってきます。
>   * 私の馬券は **断然の** 1番人気のカワカミプリンセスからでしたが、…
>

As a taru-adjective, 断然たる(態度, 意志, etc) usually means "resolute", "determined"
or "firm". 断然(と) means "determinedly", etc. (e.g., 政府に対して断然(と/たる/φ)抵抗を続ける)
This meaning is fine in serious novels, but is too stiff, literary or outdated
for a daily usage. 断然たる撥水性 sounds too grandiose and even a little funny to me.
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