loud的反义词有low、quiet、soft。
1、low意思:adj. 低的;少的;低落的;低声的;卑劣的;低等的例句:I asked them to turn the volume down low.我叫他们把音量调低一点。
2、quiet 意思:adj. 安静的;宁静的;平静的例句:When you are in a library, you must be quiet.当你在图书馆时,你必须保持安静。
3、soft意思:adj. 柔软的;柔和的;温和的;不强烈的;轻的例句:His voice was soft and I lost some of his words.他的声音很轻,有些话我没有听到。