having a sharp, pungent taste or smell; not sweet

raw berries have an intensely bitter flavour

feeling or showing anger, hurt, or resentment because of bad experiences or a sense of unjust treatment

I don't feel jealous or bitter

she wept bitter tears of self-reproach

painful or unpleasant to accept or contemplate

today's decision has come as a bitter blow

she knew from bitter experience how treacherous such feelings could be

(of wind or weather) intensely cold

a bitter February night

beer that is strongly flavoured with hops and has a bitter taste, brewed by top fermentation

a pint of bitter

the company brews a range of bitters

alcohol flavoured with bitter plant extracts, used as an additive in cocktails or as a medicinal substance to promote appetite or digestion

a dash of bitters