別に
べつに · betsuni · JLPT N3 · adverb
particularly
別 = separate, apart + に: nothing set apart, nothing special
別 means separate or different, as in 別々 (separately) and 特別 (special). 別に literally says 'in a separate way'. With a negative it means not particularly, and on its own it means nothing much. A sulky 別に! is a classic teen brush-off.