- vigorous - characterized by forceful and energetic action or activity; "a vigorous hiker"; "gave her skirt a vigorous shake"; "a vigorous campaign"; "a vigorous foreign policy"; "vigorous opposition to the war"
Antonyms: lethargic, unergetic (indirect, via energetic)
- vigorous - strong and active physically or mentally; "a vigorous old man who spent half of his day on horseback"- W.H.Hudson
Antonym: frail (indirect, via robust)