contestable
controversial
or ground
questionable
arguable
at issue
confutable
conjectural
controvertible
deniable
disputable
doubtable
doubtful
dubious
dubitable
iffy
in dispute
in doubt
in dubio
in question
mistakable
moot
open to doubt
open to question
polemic
polemical
problematic
problematical
quarrelsome
refutable
speculative
suppositional
suspect
suspicious
uncertain
undecided
unsettled
unsure
abstruse
contentious
counterintuitive
equivocal
erogenous
evidential
graze
jumpy
marshy
mountainous
precarious
southwestern
ticklish
unappropriated
undetermined
unprovable
unsettle
inflatable