brisk
Cross references:
1. agile
1. brisk \'brisk\ aj [prob. modif. of MF brusque] 1: keenly alert : LIVELY
2a: pleasingly tangy {~ tea} 2b: INVIGORATING, FRESH {~ weather} 3: sharp
in tone or manner 4: ENERGETIC, QUICK {a ~ pace} - brisk.ly av
2. brisk vt : to make brisk to become brisk {the market ~ed up}
Webster's English Dictionary