difference between しきりに or しきりと?


While looking up the meaning of 頻繁{ひんぱん}, I happened to notice that one of the
definitions quoted by デジタル大辞泉 states:

> **しきりに** 行われること

However, there's also an entry for **しきりと** (same しきり as the first, I assume,
but with particle と instead of に)

> 繰り返し何度も。ひっきりなしに。たびたび。

Both definitions sound similar--repeatedly or continually--but is there a
difference in usage between using しきり **に** and しきり **と**?




According to [デジタル大辞泉](https://dictionary.goo.ne.jp/jn/95208/meaning/m0u/),
the na-adjective しきり is ナリ活用:

> しきり【▽頻り】 の意味  
>  ［形動］［文］ **［ナリ］** 《動詞「しき（頻）る」の連用形から》  
>  ...

So it originally conjugates to its 連用形 (continuative form) しきり **に** , but しきり
**と** is also used. 明鏡国語辞典 lists both しきりに and しきりと(redirecting to しきりに, so
they have the same meaning) as 副詞. I think しきり **と** sounds a little more
casual/colloquial than しきり **に** , just as the pairs 意外 **に** /意外 **と** , 割
**に** /割 **と** , やたら **に** /やたら **と** , 自然 **に** /自然 **と**.




According to [デジタル大辞泉](https://dictionary.goo.ne.jp/jn/95208/meaning/m0u/),
the na-adjective しきり is ナリ活用:

> しきり【▽頻り】 の意味  
>  ［形動］［文］ **［ナリ］** 《動詞「しき（頻）る」の連用形から》  
>  ...

So it originally conjugates to its 連用形 (continuative form) しきり **に** , but しきり
**と** is also used. 明鏡国語辞典 lists both しきりに and しきりと(redirecting to しきりに, so
they have the same meaning) as 副詞. I think しきり **と** sounds a little more
casual/colloquial than しきり **に** , just as the pairs 意外 **に** /意外 **と** , 割
**に** /割 **と** , やたら **に** /やたら **と** , 自然 **に** /自然 **と**.

