underdetermined
underdetermine
overdetermine
put the same shoe on every foot
underdirect
solutionlessness
boundary condition
have an easy time of it
underbounded
underpoint
scarce
disconjugate
underfit
open and shut case
second best
fudge the issue
solutionless
unequipped
scrape the bottom of the barrel
undercurved
silver bullet
spot of bother
scoped
underconstrained
cut the Gordian knot
irreducible
nonparametric
unfixity
well-posed
null set
underchallenged
undermodification
unarrangeable
stiff
copout
Gordian knot
undervalue
metaproblem
inappreciable
inapproachable
uncompassable
initial value problem
underplan
toy problem
essay
underbound
limitable
enigma
ill-thought-out
underexplain