ADV-GRADED
(置于形容词和副词之前表示强调)很，非常，十分
Mighty is used in front of adjectives and adverbs to emphasize the quality that they are describing.
例句
It's something you'll be mighty proud of...
这是你们将会非常引以为豪的事情。
Being paper money, it rotted away mighty fast.
由于是纸币，所以烂得很快。