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I am reading Alita Battle Angel, and I came across a sentence that I do
understand, but for some reason is conjugated to the negative. Please could
someone break the sentence down for me?

> > (After becoming just your head, you have become rather talkative)
>>

>> 取｛と｝り憑{つ｝く体によって知能レベルがどうも **左右{さゆう}されていかん…**

>>

>> (My intelligence is influenced by the body I possess...)

My understanding is that どうも gives the meaning of 'somewhat, fairly, quite',
but I do not know why いかない is not in the plain form. Also, what does it do
when the passive form of the main verb is used?
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2019-02-24T10:12:12.297
65681
2019-02-24T11:50:31.420
2019-02-24T11:50:31.420
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question
dialects passive-voice modality によって-passives
Weird Inflection -されていかん
いかん in this sentence means "no good", "of no use", "it sucks", etc. It's
adding the speaker's feeling about the mentioned fact (左右される). いかん is almost a
lexicalized expression, and it is also used like English "oops", "don't do it"
or "oh my gosh". It sounds a little pompous or dialectal.

Related:

  * [What does ても＋いかん do?](https://japanese.stackexchange.com/q/28856/5010)
  * [Meaning of いかんしょ in following sentence](https://japanese.stackexchange.com/q/28280/5010)
  * [Use of "いかん" in the following sentences](https://japanese.stackexchange.com/q/61398/5010)
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2019-02-24T11:39:27.433
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2019-02-24T11:44:42.763
2019-02-24T11:44:42.763
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answer