waste of energy
waste of effort
unuseful
no good
inutilitarian
facility
blivit
readiness
mug's game
uselessly
ineffectual
futility
good for nothing
nutil
frustraneous
as much use as a chocolate fireguard
careless
dead donkey
vain
upter
useless
bang one's head against a brick wall
waste of time
underchallenging
pointlessly
garbageness
fruitless
ineffectively
inutility
inefficaciously
light
no use
futilely
good-for-nothing
trivially
nonintent
strike out looking
vainly
strike out
piss up a rope
bastardly
effortless
not worth a cress
waltz
drossy
unably
thinly
uneffective
not worth the powder
fool's errand
hassle
grind
swing and a miss
nonutile
Sisyphean
effortlessly
unresourceful
pointless
fol-de-rol
unusable
impertinent
nonusable
unendeavored
nonworkable
disabled
luckless
nonfailure
exercise in futility
meritless
helpless
silent
nugatory
ambitionlessness
nonfulfilment
unsuccessfully
imperviable
non-doing
unneedfulness
emptyhandedness
past it
with one's eyes closed
loon
strive
unventurous
uncomplaisant
endeavour
unintentionality
chocolate teapot
feckless
infeasible
successlessly
nonfeasible
endeavor
make bricks without straw