Synonyms:
- active,
- acute,
- adroit,
- agile,
- alacritous,
- alert,
- alive,
- apt,
- attentive,
- awake,
- brainy,
- breakneck,
- bright,
- brilliant,
- brisk,
- catty,
- clever,
- coruscating,
- dashing,
- deft,
- dexterous,
- dispatchful,
- double-quick,
- eagle-winged,
- energetic,
- expeditious,
- express,
- fast,
- featly,
- fleet,
- flying,
- galloping,
- gifted,
- graceful,
- hair-trigger,
- handy,
- hasty,
- headlong,
- hustling,
- intelligent,
- keen,
- keen-witted,
- light,
- light of heel,
- light-footed,
- lightsome,
- limber,
- lithe,
- lively,
- mercurial,
- neat-fingered,
- neat-handed,
- nimble-footed,
- nimble-witted,
- no dumbbell,
- not born yesterday,
- on the,
- on the alert,
- on the ball,
- on the job,
- peart,
- precipitate,
- prompt,
- qui vive,
- quick,
- quick as lightning,
- quick as thought,
- quick-thinking,
- quick-witted,
- rapid,
- ready,
- reckless,
- running,
- scintillating,
- sharp,
- sharp-witted,
- sleepless,
- smart,
- snappy,
- spanking,
- sparkling,
- speedy,
- sprightly,
- spry,
- steel-trap,
- sure-footed,
- swift,
- talented,
- unblinking,
- unnodding,
- unsleeping,
- unwinking,
- vigilant,
- wakeful,
- watchful,
- wide-awake,
- winged,
- zippy