actively
animatedly
ardently
arduously
assiduously
bec et ongles
briskly
con brio
difficultly
diligently
effortfully
energetically
fervently
forcefully
forcibly
hammer and tongs
hard
hardly
heart and soul
heartily
indefatigably
industriously
intensely
keenly
laboriously
lustily
manfully
operosely
painfully
relentlessly
sedulously
spiritedly
the hard way
tirelessly
toilsomely
tooth and nail
unsparingly
vehemently
vigorously
vivaciously
with a will
with difficulty
with effort
with much ado
with pep
zealously
zestfully