The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; keenness of reproach or sarcasm; deep distress, grief, or vexation of mind
Bitterness in wine may be caused by the grape variety, an extremely dry climate during the growing season, or simply from poor wine making Bitterness is the result of excess tannin