bitter

adjective
  1. Having a sharp, pungent taste or smell; not sweet. adjective
    The coffee was too bitter for my taste.
    She grimaced at the bitter taste of the medicine.
  2. Causing pain or distress; harsh or unpleasant. adjective
    He felt a bitter disappointment after losing the match.
    The bitter truth was hard to accept.
  3. Characterized by intense antagonism or hostility. adjective
    The debate turned into a bitter argument.
    They had a bitter rivalry that lasted for years.
  4. A type of beer that is strongly flavored with hops and has a bitter taste. noun
    He ordered a pint of bitter at the pub.
    The brewery is known for its traditional English bitter.
  5. To make or become bitter. verb
    The experience had bittered him over time.
    The harsh words only served to bitter their relationship.