1) Acutely 2) Aggressively 3) Ardently 4) Extremely 5) Forcefully 6) Genuinely 7) Greatly 8) In a deep way 9) In an intense manner 10) Powerfully 11) Profoundly 12) Severely 13) Sincerely 14) Totally 15) Truly 16) Violently 17) With a passion 18) With great concentration 1) Atafeverpitch 2) Brightly 3) Brilliantly 4) Deeply 5) Eagerly 6) Fervently 7) Passionately 8) Very 
• (adv.) To an extreme degree; as, weather intensely cold. • (adv.) Intently.
In·tense'ly adverb 1. Intently. [ Obsolete] J. Spencer. 2. To an extreme degree; as, weather intensely cold. 
[adv] - in an intense manner
adverb in an intense manner; `he worked intensely`