speeding up

词形变化：

副词: speedily | 形容词比较级: speedier | 形容词最高级: speediest | 名词: speediness |

同义词：

fast | rapid | quick | swift | fleet | hasty | expeditious | nimble | express | flying | summary | lightning | immediate | prompt | early | hurried | fast-moving | speeding |

反义词：

dilatory |