/ ˈvɪgərəs; NAmE / adjective
1.
very active, determined or full of energy
SYN energetic :
a vigorous campaign against tax fraud
a vigorous opponent of the government
Take vigorous exercise for several hours a week.
2.
strong and healthy :
a vigorous young man
This plant is a vigorous grower.
► vig·or·ous·ly adverb
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WORD ORIGIN
Middle English : via Old French from medieval Latin vigorosus , from Latin vigor , from vigere be lively.