'Mightily' definitions:

Definition of 'mightily'

adverb

Powerfully or vigorously; "he strove mightily to achieve a better position in life"

adverb

(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" [syn: mighty, mightily, powerful, right]

Definition of 'Mightily'

From: GCIDE

Mightily \Might"i*ly\, adv. [From Mighty.]
1. In a mighty manner; with might; with great earnestness; vigorously; powerfully. [1913 Webster]
Whereunto I also labor, striving according to his working, which worketh in me mightily. --Col. i. 29. [1913 Webster]
2. To a great degree; very much. [1913 Webster]
Practical jokes amused us mightily. --Hawthorne. [1913 Webster]

Synonyms of 'mightily'

From: Moby Thesaurus

almighty,
arduously,
authoritatively,
awfully,
big,
cogently,
commandingly,
consequentially,
deafeningly,
dynamically,
effectively,
effectually,
energetically,
ex cathedra,
exceedingly,
extremely,
firmly,
forcefully,
forcibly,
greatly,
hardly,
heartily,
highly,
hugely,
imperatively,
imperviously,
impregnably,
intensely,
invincibly,
invulnerably,
irresistibly,
just,
laboriously,
loudly,
lustily,
might and main,
mighty,
momentously,
notably,
officially,
only too,
potently,
powerful,
powerfully,
pretty,
productively,
puissantly,
pungently,
quite,
real,
really,
resistantly,
right,
robustly,
ruggedly,
so,
soundly,
stalwartly,
staunchly,
stoutly,
strenuously,
strikingly,
strongly,
sturdily,
surpassingly,
tellingly,
terribly,
terrifically,
to good account,
to good purpose,
toilsomely,
unyieldingly,
very,
vigorously,
weightily,
with a vengeance,
with authority,
with telling effect