"briskest" in the adjective sense
1. alert, brisk, lively, merry, rattling, snappy, spanking, zippy
quick and energetic
"a brisk walk in the park"
"a lively gait"
"a merry chase"
"traveling at a rattling rate"
"a snappy pace"
"a spanking breeze"
2. bracing, brisk, fresh, refreshing, refreshful, tonic
imparting vitality and energy
"the bracing mountain air"
3. brisk
very active
"doing a brisk business"
Source: WordNet® (An amazing lexical database of English)
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