1) Bitingly 2) Coldly 3) Disagreeably 4) Piercingly 5) Sharply 6) Spitefully 1) Discordantly 2) Enviously 3) Extremely and sharply 4) Grudgingly 5) Harshly 6) How some resent 7) How sore losers lose 8) In a disagreeable way 9) Jealously 10) Rancorously 11) Sourly 12) Spitefully 13) Sullenly 14) Ungraciously 15) Unpleasantly 16) Viciously 17) With acerbity 18) With antagonism 
• (adv.) In a bitter manner.
Bit'ter·ly adverb In a bitter manner. 
[adv] - indicating something hard to accept 2. [adv] - in a resentful manner
with bitterness adverb in a resentful manner; `she complained bitterly`