Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
briskness is a noun meaning "liveliness and eagerness". It carries one recorded sense.
liveliness and eagerness
“he accepted with alacrity”
“the smartness of the pace soon exhausted him”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for briskness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.