bitterly

Etymology

From Middle English bitterli, biterli, biterliche, from Old English biterlīċe, bitterlīċe (“bitterly”), equivalent to bitter + -ly. Cognate with German Low German bitterlik (“bitterly”), German bitterlich (“bitterly”), Swedish bitterligen (“bitterly”).

adv

1. In a bitter manner.
   Heidi threw herself down beside Clara's chair and began to cry bitterly. 1956 [1880], Johanna Spyri, Heidi, translation of original by Eileen Hall, page 91
   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. October 1, 2011, Phil McNulty, “Everton 0-2 Liverpool”, in BBC Sport