bitterly

As a verb browse

is to scan, to casually look through in order to find items of interest, especially without knowledge of what to look for beforehand.

As a noun browse

is young shoots and twigs.

As an adverb bitterly is

in a bitter manner.

As adverbs the difference between desperately and bitterly

is that desperately is in a desperate manner; without regard to danger or safety; recklessly while bitterly is in a bitter manner.

As adverbs the difference between violently and bitterly

is that violently is in a violent manner while bitterly is in a bitter manner.

As adverbs the difference between bitterly and cruelly

is that bitterly is in a bitter manner while cruelly is in a cruel manner.

As adverbs the difference between seriously and bitterly

is that seriously is (manner) in a serious or literal manner while bitterly is in a bitter manner.

As adverbs the difference between bitterly and angerly

is that bitterly is in a bitter manner while angerly is (archaic) angrily.

As adverbs the difference between angrily and bitterly

is that angrily is in an angry manner; under the influence of anger while bitterly is in a bitter manner.

As adverbs the difference between harshly and bitterly

is that harshly is in a harsh manner; severely while bitterly is in a bitter manner.