Diminish/dɪˈmɪnɪʃ/ Definition 1 of 3Pro Tip 1/3Progressive Action Use 'diminish' to describe an ongoing process, suggesting gradual decrease. The enthusiasm for the project diminished over time. Pro Tip 2/3Emotional Weakening 'Diminish' often conveys a weakening of emotions, resolve, or determination. Her resolve diminished after several setbacks. Pro Tip 3/3Not Negative Diminishing something isn't always bad; it can be positive if reducing something harmful. The new policy diminished the number of accidents.