cost-plus
open-ended
unexplained
unsettled
accidental
adventitious
aleatoric
aleatory
ambitendent
ambivalent
amorphous
at issue
at loose ends
bleary
blobby
blurred
blurry
broad
capricious
casual
causeless
chance
chancy
changeable
chaotic
conditional
conditioned
confused
contingent
dependent
depending
destinal
dicey
dim
disordered
double-minded
dubious
fatal
fatidic
fence-sitting
fence-straddling
fickle
fluky
foggy
fortuitous
fuzzy
general
groundless
hazy
hit-or-miss
iffy
ill-defined
imprecise
in question
controvertible
debatable
determinate
disputable
indefinite
indeterminate
indexical
irresolute
unappropriated
unassigned
unattained
unclear
undecided
undefined
undescribed
undisclosed
unfound
unfulfilled
unrealised
unrevealed
unsettle
unspecified
untitled
determined
predetermined