Open English Wordnet
Adverbs
(r)mightilypowerfully or vigorously“he strove mightily to achieve a better position in life” (r)mighty, mightily, powerful, right(Southern regional intensive) very; to a great degree“the baby is mighty cute”,
“he's mighty tired”,
“it is powerful humid”,
“that boy is powerful big now”,
“they have a right nice place”,
“they rejoiced mightily”