Redesigned Seattle ship is dull (9)

I believe the answer is:

tasteless

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'is dull' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for tasteless that I've seen before include "Lacking flavour or ability to appreciate the beautiful" , "Lacking flavour or aesthetic appreciation" , "Vapid" , "Unseemly" , "Lacking in aesthetic judgement" .)

I've seen this clue in The Sun.

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