strenuous

Synonyms: arduous demanding effortful energy-consuming exhausting hard herculean laborious mean operose taxing toilful toilsome tough tough going uphill wicked

Antonyms: easy effortless facile

Synonyms: active aggressive ardent bold determined dynamic eager earnest lusty persistent red-blooded resolute spirited strong tireless vigorous vital

Antonyms: apathetic enervated lethargic unenthusiastic