Adj. | 1. | colorless - lacking in variety and interest; "a colorless and unimaginative person"; "a colorless description of the parade" dull - lacking in liveliness or animation; "he was so dull at parties"; "a dull political campaign"; "a large dull impassive man"; "dull days with nothing to do"; "how dull and dreary the world is"; "fell back into one of her dull moods" |
2. | colorless - weak in color; not colorful achromatic, neutral - having no hue; "neutral colors like black or white" |