Ferocious; stormy (4)
I believe the answer is:
wild
I believe this is a double definition.
'ferocious' is the first definition.
(similar in meaning)
'stormy' is the second definition.
(similar in meaning)
(Other definitions for wild that I've seen before include "Impulsive" , "Savage" , "Fierce" , "Not tamed" , "Not domesticated" .)