col ‧ our ‧ less BrE AmE British English , colorless American English /ˈkʌlələs $ ˈkʌlər-/ adjective
[ Word Family: noun : COLOUR/COLOR , COLOURING/COLORING , ↑ coloration , COLOURANT/COLORANT , COLOURIST/COLORIST ; adjective : COLOURED/COLORED , discoloured/discolored, COLOURFUL/COLORFUL ≠ COLOURLESS/COLORLESS , ↑ multicoloured , COLOUR/COLOR ; verb : COLOUR/COLOR ; adverb : COLOURFULLY/COLORFULLY ≠ COLOURLESSLY/COLORLESSLY ]
1 . having no colour:
a colourless odourless gas
2 . if your face, hair, eyes, skin, or lips are colourless, they are very pale, usually because you are ill or frightened
3 . not interesting or exciting SYN dull :
his colourless personality
—colourlessly adverb