Webster's English Dictionary

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vigorous

vig.or.ous \'vig-(*-)r*s\ aj [ME, fr. MF, fr. OF, fr. vigor] 1: possessing 
   vigor : full of physical or mental strength or active forc e : STRONG {a ~ 
   youth} {a ~ plant} 2: done with vigor : carried out forcefully and 
   energetically {~  enforcement of laws}RVOUS mean having great vitality and 
   force. VIGOROUS further implies showing no signs of depletion or 
   diminishing of freshness or robustness; ENERGETIC suggests a capacity for 
   intense activity; STRENUOUS suggests a preference for coping with the 
   arduous or the challenging; LUSTY implies exuberant energy and capacity for 
   enjoyment; NERVOUS suggests esp. the forcibleness and sustained 
   effectiveness resulting from mental vigor - vig.or.ous.ly av SYN syn 
   VIGOROUS, ENERGETIC, STRENUOUS, LUSTY, NE