More unsightly (6)
I believe the answer is:
uglier
'more unsightly' is the definition.
('ugly' can be similar in meaning to 'unsightly')
This is all the clue.
(Other definitions for uglier that I've seen before include "More 14 down" , "Not so pretty" , "with worse features" , "More displeasing to the senses" , "Less like a peach" .)