Extremely unpleasant (8)

I think it could be either:

Which length description are you looking for?:

gruesome

'extremely unpleasant' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for gruesome that I've seen before include "Revolting, filling one with horror and disgust" , "terrible" , "'Ghastly, grisly (8)'" , "Go, resume being revolting or gruesome" , "Repulsive, horrific" .)

I've seen this clue in The Guardian, the Irish Times (Simplex), The Times, The Telegraph and The Washington Post.

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