arduousness
strenuousness
laboured
readiness
facility
like it's going out of style
Sisyphean
someone's heart out
arduous
a hundred and ten percent
operose
backbreaking
punishing
grueling
hard
heavy
gruelling
laborious
toilsome
lyricism
thinly
difficult
sloggingly
prima donna
endeavor
obsessivity
efficiency
nitency
obsessiveness
overeagerness
lightweight
hyperingenuity
sweaty
backbreaker
spuriosity
struggle
overmasterfulness
pretentiously
showoff
fight
overearnest
labouring
drudging
laboring
arduously
toiling
one's socks off
winsomely
thin
engagingly