All colourful antonyms

adjective colourful

• dull — not sharp; blunt: a dull knife.
• uninteresting — engaging or exciting and holding the attention or curiosity: an interesting book.
• pale — light-colored or lacking in color: a pale complexion; his pale face; a pale child. lacking the usual intensity of color due to fear, illness, stress, etc.: She looked pale and unwell when we visited her in the nursing home.
• plain — clear or distinct to the eye or ear: a plain trail to the river; to stand in plain view.
• simple — easy to understand, deal with, use, etc.: a simple matter; simple tools.
• weak — not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor.
• boring — Someone or something boring is so dull and uninteresting that they make people tired and impatient.
• colourless — Something that is colourless has no colour at all.
• drab — dull; cheerless; lacking in spirit, brightness, etc.
• dreary — causing sadness or gloom.
• faded — to lose brightness or vividness of color.
• lifeless — not endowed with life; having no life; inanimate: lifeless matter.
• colored — Something that is colored a particular color is that color.
• uncolorful — abounding in color: In their tartans, the Scots guard made a colorful array.
• common — If something is common, it is found in large numbers or it happens often.
• normal — conforming to the standard or the common type; usual; not abnormal; regular; natural.
• standard — something considered by an authority or by general consent as a basis of comparison; an approved model.