tenaciously Synonyms

doggedly with heavy hand obdurately mulishly deucedly severely adamantly tuggingly toughly tightly strongly strictly obstinately stubbornly dauntlessly unwaveringly stolidly stickily single-mindedly unyieldingly pertinaciously perseveringly indomitably faithfully decisively stoutly stiffly steadily firmly firm FAST diligently determinedly decidedly courageously constantly bravely boldly fixedly hard indefatigably steadfastly staunchly solidly securely rigidly resolutely persistently intently insistently