overdetermine
underdetermined
passless
incicurable
unguidable
unsolvable
bo bian
overlimited
unalleviable
wherever you go, there you are
candy store problem
uncountably
unresolvably
unsolvably
uncounterable
overdetermined
underdetermine
goat rope
max out
insoluble
it can't be helped
nothing for it
underplan
overhelp
inextricable
unhandleable
fixed limit
unaidable
rearrange the deck chairs on the Titanic
spin one's wheels
sticking plaster
undereffective
overpursue
exercise in futility
noncomputable
unguaranteeable
foreshoot
superwicked
insupportable
porism
unrestrictable
incalculable
spread oneself thin
unachievable
nonallowable
unguidably
overchallenge
nonlimitation
bursting point
back to the wall
overcomplicate
nearly never bulled a cow
irrestrainable
half-measure
ungrantable
hydra
yak shaving
backtracking
unstable
unloosenable
promise the moon
precarious
go overboard
tameless
unloosable
unsuperable
metaproblem
frob
second best
halfway decent
copout
in difficulties
underchallenge
immitigable
pseudosolution
nonfeasible
unimplementable
stumbling stone
undercurved
unfixity
solutionless
Chinaman's chance
infeasible
boundary condition
weigh down
enigma
scrabbly
brain-teaser
bay
riddle
epsilontic
infeasibly
dead end
conundrum
approachless
waymaking
unavoidable
dead-end