This is the 2069th most frequent Japanese word.
別に
"Not particularly" or "nothing special."
In this sentence, '別に' is used to express 'not particularly,' showing a lack of specific concern or emphasis on the matter.
別に気にしていないよ。
I don't particularly mind.
Here, '別に' indicates that something is not considered of particular importance.
それは別に重要じゃない。
That isn't especially important.
In this example, '別に' functions to show the absence of specific negative feelings.