(mightier, mightiest)
1.
Mighty is used to describe something that is very large or powerful. (LITERARY)
There was a flash and a ~ bang.
ADJ: usu ADJ n
2.
Mighty is used in front of adjectives and adverbs to emphasize the quality that they are describing. (mainly AM INFORMAL)
It’s something you’ll be ~ proud of...
ADV: ADV adj/adv emphasis
3.
see also high and ~