A novel I'm reading contains this snippet of dialogue. The manager of a love
hotel is explaining why she doesn't return to her apartment between shifts:

> 帰ったって何があるってわけじゃなし、誰が待っているわけじゃなし、ホテルの仮眠室で寝て、起きてそのまま仕事をすることの方が多い。

Does the わけじゃなし here parse to "わけ じゃ 無し", or is she dropping the ”い” in "わけ じゃ
ない し"? Just in case it might be relevant, she speaks very colloquially, and is
from the Yamagata countryside, although I can't detect any particular
regionalisms in her speech. The setting is Tokyo.

If it is "わけ じゃ 無し", how does it work grammatically?

{EDIT-ADDENDUM} For anyone who's interested, I asked a native speaker about
this, and his impression was that "わけじゃなし" adds an edge of scorn (「ばかにする」 is
the way he put it) that "わけじゃないし" doesn't have, but with the same meaning. He
also reckoned that it derives from "無し", although, personally, I still think
that's an open question. Where's an etymologist when you need one?
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grammar
How to parse わけじゃなし
I honestly think this is nothing more than a dropped い, and the proper
rendering is わけじゃない:

> 帰ったって何があるって **わけじゃない** し、誰が待っている **わけじゃない**
> し、ホテルの仮眠室で寝て、起きてそのまま仕事をすることの方が多い。
>
> **It's not like** I have something to do if I go home, and **it's not as
> if** someone's waiting for me, so more often than not I sleep in the hotel's
> break room and start working after I wake up.

It wouldn't be the first time い has been squished out of the sentence by its
neighbors. Poor い has never really been able to stand up for itself, what with
those two short strokes separated by that gap. It starts with changing ～ている to
～てる, and then before you know it, someone goes and changes ～ない to ～ねぇ, and it
just gets worse from there.

You can stop this syllable dropping madness! Join the Global い Preservation
Alliance today!
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I asked a handy native speaker (Tokyo linguistic area) about this one and got
an interesting response. They had no comment on where exactly なし comes from,
but they perceived a specific difference between なし and ないし:

  * A ってわけじゃないし、 B ってわけじゃないし... = "For one thing, it's not A; for another, it's not B..." -- the しs signpost that it all adds up into a coherent whole, a multifaceted _argument_ if you like.
  * A ってわけじゃなし、 B ってわけじゃなし... = "It's not A, it's not B..." -- the two parts are separate; there is no "link" from A to B; it is a series of discrete assertions rather than a guided tour through an argument.

In a comment above Tsuyoshi says that わけじゃなし has the same meaning as わけじゃないし,
so this might just be my informant's idiolect (or Tsuyoshi's!), but I thought
I'd throw this up anyway, for interested parties.
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I think you should count でなし, じゃなし (ではなし), and でもなし special idioms. They are
unrelated to し in ～ないし.

Grammatically, they are highly unique that they are allowed to connect
directly after the **dictionary form** of a verb, which is an almost lost
particle usage (連体形準体法) except for [several combinations of
に](https://japanese.stackexchange.com/q/27907/7810)
([2](https://japanese.stackexchange.com/q/5069/7810),
[3](https://japanese.stackexchange.com/q/29886/7810),
[4](https://japanese.stackexchange.com/q/29418/7810)) and a few [sporadic
cases](https://japanese.stackexchange.com/q/25955/7810).

> ○ 誰が待っているわけじゃなし  
>  ○ 誰が待っているじゃなし  
>  × 誰が待っているじゃないし (unless 誰が待っている is somebody's quote)

From meaning, they carry a certain connotation the Classical なし used to have
as 終止形 "terminal form" of adjective, which is signifying the end of the
sentence. Of course, we no longer speak Classical Japanese and they are used
more as subordinate clauses rather than in the real end of sentences. But they
still take advantage of this nature to create a feeling that you end the
clause "abruptly". What I mean is that, they work as if _semicolon_ -ed
clauses as below:

> 帰ったって何があるってわけじゃなし、誰が待っているわけじゃなし、ホテルの仮眠室で寝て、起きてそのまま仕事をすることの方が多い。  
>  _I don't have anything back at home; I don't have anyone waiting for me;
> most of the time I sleep in the hotel's resting room and just continue
> working after I get up._

Apparently, this kind of phrasing would be handy in some styles of speech,
because otherwise Japanese rarely allows you to link phrases without a
conjunctional element (there's no "no music, no life" construction in
Japanese). When you use ～ないし, it will be correctly like the translation
@DerekSchaab has provided.

**PS**  
You may see these forms followed by に, in this case they are equivalent to ～なく
or ～なくて.

> 見るでもなしに眺めている  
>  見る（わけ）でもなく眺めている  
>  _be staring it blankly without looking [at anything particular]_
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