bitterly

adverbs

with bitterness, in a resentful manner
"she complained bitterly"
bitterly
is derived from
bitter
indicating something hard to accept
"he was bitterly disappointed"
bitterly
is derived from
bitter
extremely and sharply
"it was bitterly cold"; "bitter cold"
bitingly, bitter, bitterly, piercingly
is derived from
bitter