Structure
別に + Verb[ない]
別に + [い]Adjective[ない]
別に + [な]Adjective + ではない(1)
別に + Noun + ではない(1)
(1) じゃない
Details
- Standard 
About 別に〜ない
When paired with ない (either the い-Adjective or the auxiliary verb), the adverb 別に 'separately' changes slightly in definition to that of 特に 'especially'. Let's have a look at a few examples.
This 'especially' nuance of 別に comes from 'separately' being negated. The literal meaning of 別に~ない is something like '(A) cannot be separated/differentiated'. This comes across as 'maybe it is a little (A), maybe a lot (A), but in any case, it cannot be said that it IS (A)'.
Caution
別に will quite often be paired with わけではない, as they both express uncertainty. However, it should never be paired with わけがない, as this would be combining a statement that removes certainty, with one that adds certainty.
Related
Examples
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- トムが悪いとは別にいっていないよ。 - I'm not really saying that Tom is bad. (not particularly) 
- それは別に悪いことではないよ。 - That's not particularly a bad thing. 
- 別に夢がないわけではないよ。 - It is not that I don't really have a dream. 
- 私はそんなに音楽がうるさくても、別に気にしない。 - Even if the music is that loud, I don't particularly care. 
- 別に楽しくないわけではない。少し疲れているだけだ。 - It is not like I am not particularly having fun. I am just a bit tired. 
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別に〜ない – Grammar Discussion
Most Recent Replies (2 in total)
 - someone2020 - What’s the nuance/difference between this, もっとも。。ない、とても。。ない、and すこしも。。ない? 
 - Daru - Nuance and degree! - 最も~ない - Least of all 
 とても~ない - Not at all
 少しもない - Not in the slightest
 別に~ない - Not particularly- They resemble each other, but the basic meaning is easy to tell from the kanji! Hope this helps. 
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