Synonyms of 'jet-black'
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Something that is black is of the darkest colour that there is, the colour of the sky at night when there is no light at all.
He had thick black hair.
Something that is ebony is a very deep black colour.
He had rich, soft ebony hair.
Thesaurus for jet-black from the Collins English Thesaurus
Something that is jet black is a very intense black.