Definitions

1. adjective

having a bitter taste or smell, or extremely unpleasant.

“The bitterish flavor of the medicine made her wrinkle her nose.”

2. adverb

in a bitter manner, or extremely unpleasantly.

“She spoke to him bitterish, her voice dripping with anger.”

3. noun

A quality or state of being bitter or unpleasant.

“The bitterish atmosphere hung over the city for days after the storm.”