That may be diminished

One who, or that which, diminishes something.

plural of diminisher

(idiomatic) A condition in which additional inputs into an organization, project or process produce progressively fewer or lower-quality additional outputs, and may, in extreme cases, cause the total quantity or quality of outputs to decrease.

The tendency for a continuing effort toward a particular goal to decline in effectiveness after a certain amount of success has been achieved.

(music) A musical interval of the Western twelve-semitone system consisting of four semitones and spanning four degrees of the diatonic scale. It is one semitone narrower than a perfect fourth and enharmonically equivalent to a major third.

(music) A type of tritone in musical composition comprising six semitones. It spans five diatonic scale degrees like a perfect fifth but narrower by a semitone. The number of diatonic degrees it spans is what distinguishes it from an augmented fourth.

plural of diminished seventh

(music) A musical interval of the Western twelve-semitone system consisting of nine semitones and spanning seven degrees of the diatonic scale. It is one semitone narrower than a minor seventh and enharmonically equivalent to a major sixth.

(music) A musical interval of the Western twelve-semitone system consisting of eleven semitones and spanning eight degrees of the diatonic scale. It is one semitone narrower than a perfect octave and enharmonically equivalent to a major seventh.