Structure of ～くもなろうものだ


> 久方ブリダナ…百年前我ヲ封ジタ  
>  タカマガハラノ 野良大神ヨ  
>  我ヲ仕損ジテ石クレニ成リ果テルモ  
>  マダ我ニ拘ッテイルトハ  
>  "石ノ中ニモ百年"カ  
>  …黴臭 **クモナロウモノダ** ！ ([source:
> 『大神』](http://otento.mikosi.com/ookami/ookami16.html))

Said by the villain to the protagonist, who's been sleeping as a stone statue
for the last hundred years. What I'd like to know is how to analyze くもなろうものだ
and what exactly it means. I assume it's supposed to say something to the
effect of "It's no wonder you grow moldy." but I'm really at a loss here as to
how it functions grammatically.

I've tried googling the phrase in question and came up with other examples:

> [そりゃあいい加減に暴れ出しくもなろうものだ](https://ncode.syosetu.com/n3974do/40/)  
>
> [来年、再びナツツバキの白さを目にすることはないのかもしれない。そう思えば感傷的にもなろうものだ。](https://ncode.syosetu.com/n8173by/253/)

Is it an alternative to 黴臭くもなるだろうものだ? だろう as an indirect statement and ものだ to
state general facts? Does that even make sense?




This も and this ものだ have nuances.

> 黴臭クモナロウモノダ！  
>  It's only natural that someone like you will become moldy!

  * This も has the meaning of "no wonder". See the following questions: 
    * [かわりもしますよ what is the meaning of this も?](https://japanese.stackexchange.com/q/82516/5010)
    * [What does this type of sentence structure (Verb- dictionary form+のも（は）もっともだ) mean](https://japanese.stackexchange.com/q/54017/5010)
  * This ものだ is used to describe an unavoidable general fact ([examples](https://japanese.stackexchange.com/a/49136/5010)). This is why I used "someone like you" as the subject in the above translation, although this is not strictly necessary. 
    * [How to parse 親も辞書を買ってやったかいがあるってもんだ](https://japanese.stackexchange.com/q/28872/5010)

> Adding it to a phrase can have the effect of turning a singular event into a
> generalized phenomenon.

The なろう here is roughly the same as なるだろう, but だろうものだ sounds strange to me. I
think this is due to some grammatical restriction I'm not consciously aware
of. You can remove ものだ and just say "黴臭くもなるだろう!" without largely changing the
meaning of the sentence.




This も and this ものだ have nuances.

> 黴臭クモナロウモノダ！  
>  It's only natural that someone like you will become moldy!

  * This も has the meaning of "no wonder". See the following questions: 
    * [かわりもしますよ what is the meaning of this も?](https://japanese.stackexchange.com/q/82516/5010)
    * [What does this type of sentence structure (Verb- dictionary form+のも（は）もっともだ) mean](https://japanese.stackexchange.com/q/54017/5010)
  * This ものだ is used to describe an unavoidable general fact ([examples](https://japanese.stackexchange.com/a/49136/5010)). This is why I used "someone like you" as the subject in the above translation, although this is not strictly necessary. 
    * [How to parse 親も辞書を買ってやったかいがあるってもんだ](https://japanese.stackexchange.com/q/28872/5010)

> Adding it to a phrase can have the effect of turning a singular event into a
> generalized phenomenon.

The なろう here is roughly the same as なるだろう, but だろうものだ sounds strange to me. I
think this is due to some grammatical restriction I'm not consciously aware
of. You can remove ものだ and just say "黴臭くもなるだろう!" without largely changing the
meaning of the sentence.

