別に〜ない

別に〜ない is used to deny that something is particularly true or noteworthy, often downplaying one's feelings or the importance of a situation. It answers or counters an assumption or prior question with a sense of indifference or mild surprise. The nuance is closer to “not especially” or “not really” rather than a definite denial. It can soften a response that might otherwise sound blunt, and is commonly used in casual speech. Often appears with contexts like: 別に大したことない (It's not that big of a deal), 別に好きじゃない (I'm not really fond of it), or 別に関係ない (It's not relevant to me / I don't care). Note that 何も〜ない or 特に〜ない can reinforce the sense of indifference.