What does the word bitter mean?

Usage examples for bitter

  1. " It is madness now," said the bitter mother. – Stingaree by E. W. (Ernest William) Hornung
  2. I said to myself again, with a bitter laugh. – Burr Junior by G. Manville Fenn
  3. " He came to me," Margaret continued, " when I was hard and bitter about life, when I was dead.... – Together by Robert Herrick (1868-1938)