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col‧our‧less British English ; colorless American English

1 having no colour :
a colourless, odourless gas
a colourless, odourless gas2 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 [= dull]:
his colourless personality
his colourless personality —colourlessly adverb




