Very powerful or strong (6)
I believe the answer is:
mighty
I believe this is a double definition.
'very powerful' is the first definition.
(I've seen this before)
'strong' is the second definition.
(thesaurus)
(Other definitions for mighty that I've seen before include "Powerful - huge" , "Powerful and great" , "Very powerful/strong" , "Strong, powerful" , "Arrogant people are often described as high and . . . . . ." .)