Most powerful (9)
'most powerful' is the definition.
('mighty' can be similar in meaning to 'powerful')
This is all the clue.
(Other definitions for mightiest that I've seen before include "Strongest" , "Most powerful" .)
'most powerful' is the definition.
('strong' is associated in meaning with 'powerful')
This is all the clue.
(Other definitions for strongest that I've seen before include "Most physically powerful" , "Most muscular or powerful" , "Most forceful" , "Having the greatest strength" , "With greatest power" .)