Strenuously

Adverb

 * 1) In a strenuous manner.

Thesaurus
actively, animatedly, ardently, arduously, assiduously, bec et ongles, briskly, con brio, difficultly, diligently, effortfully, energetically, fervently, forcefully, forcibly, hammer and tongs, hard, hardly, heart and soul, heartily, indefatigably, industriously, intensely, keenly, laboriously, lustily, manfully, operosely, painfully, relentlessly, sedulously, spiritedly, the hard way, tirelessly, toilsomely, tooth and nail, unsparingly, vehemently, vigorously, vivaciously, with a will, with difficulty, with effort, with much ado, with pep, zealously, zestfully