Why Fiji is sillier than Fuji? (7)
I believe the answer is:
dottier
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for dottier that I've seen before include "Detroit (anag) - more eccentric" , "Crazier" , "with even less reason" , "more absurd" , "less rational" .)