Light is composed of many colors like these ones of the visual spectrum: red, orange, yellow, green, blue, and violet. Let us close our eyes for a moment and visualize and imagine grey color everywhere- outside and inside, outwards and within, up and down, forward and backward. How do we feel? Do we feel elated, furious, confident, or dull?
Yes, that is what grey symbolic of! Our minds are programmed to respond to color. The subliminal messages we get from color shape our thoughts. Our hair turn grey gradually so does the sky after sunset. Thus, grey is symbolic of dullness.
All the dullness, tediousness, dreadfulness, lethargy comes from grey.
Grey fits into the category of neutral colors like whites, blacks, and browns.
It is true that colors mean a lot and symbolize a lot many traits. The evidence of this fact can be obtained from the Bible, which illustrates how darkness was used as the second to last plague causing distress. Thus grey has a negative connotation and is associated with darkness, dullness, withering, and decay.