colourless vs dulled

colourless and dulled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
colourless	No	Yes	No	No
dulled	No	Yes	No	No

colourless (adjective)	dulled (adjective)
weak in color; not colorful	deprived of color
lacking in variety and interest	made dull or blunt
	having lost or been caused to lose interest because of overexposure