mindmap root((尖刻)) caustic suggests a biting wit: ~ comments about her singing ability. mordant suggests a wit that is used with deadly effectiveness: ~ reviews put the play out of its misery. acrid implies bitterness and often malevolence: a speech marked by ~ invective. 词根ACR表示锐利sharp或酸sour，如acid酸，acrimony尖刻言辞激烈争吵, exacerbate恶化 scathing implies indignant attacks delivered with fierce or withering severity: a ~ satire of corporate life.