bitter
US /ˈbɪt̬.ɚ/
UK /ˈbɪt̬.ɚ/

1.
2.
feeling or showing deep and intense sorrow or resentment
:
•
He felt bitter about losing the competition.
•
Her words were full of bitter criticism.
3.
difficult or unpleasant to accept or experience
:
•
It was a bitter pill to swallow, but he had to admit defeat.
•
They faced bitter opposition to their plans.