Bitterly

Bit′ter-ly

,

adv.

In a bitter manner.

,

adv.

With a bitter taste.

1.

In a severe manner; in a manner expressing poignant grief; as, to weep bitterly.

2.

In a manner severely reproachful; sharply; severely; angrily; as, to censure bitterly.

bitterly ‎(comparative more bitterly, superlative most bitterly)

In a bitter manner.
- 1898, Winston Churchill, chapter 4, in The Celebrity:
  Judge Short had gone to town, and Farrar was off for a three days' cruise up the lake. I was bitterly regretting I had not gone with him when the distant notes of a coach horn reached my ear, and I descried a four-in-hand winding its way up the inn road from the direction of Mohair.
- 2011 October 1, Phil McNulty, “Everton 0-2 Liverpool”, in BBC Sport:
  Liverpool's £58m strikeforce of Andy Carroll and Luis Suarez scored the goals that settled the Merseyside derby at Goodison Park - but Everton were left complaining bitterly about Jack Rodwell's controversial early red card.

in a bitter manner