colourless vs wan

colourless and wan both are adjectives.

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

colourless (adjective)	wan (adjective)
weak in color; not colorful	abnormally deficient in color as suggesting physical or emotional distress
lacking in variety and interest	(of light) lacking in intensity or brightness; dim or feeble
	lacking vitality as from weariness or illness or unhappiness

colourless (verb)	wan (verb)
	become pale and sickly