The word "Griper" is a negative term that describes someone who is frequently complaining or griping about something. Opposite to it, we have antonyms that describe people with the opposite attitude. One such antonym for "Griper" is "Optimist," which refers to a person who looks at the brighter side of things and always sees the good in them. Another antonym that can be used to describe the opposite of a "Griper" is "Content," which refers to a person who is happy with what they have and does not wish for more. These antonyms help us to understand the characteristics and attitude of an individual towards life and situations.