# πικραίνω/pikrainō This word is an action. It is a verb. * This word means to make bitter. This means to make something have an unpleasant taste. Bitter is the opposite of sweet. * Sometimes this word is used to talk about something causing someone to have a bitter stomach. This means the thing causes pain in the person’s stomach. * Sometimes this word is used to talk about making a person bitter. This means to make a person angry, irritated, or resentful.