deniable
arguable
at issue
confutable
conjectural
contestable
controversial
controvertible
debatable
defeasible
disprovable
disputable
doubtable
doubtful
dubious
dubitable
iffy
in dispute
in doubt
in dubio
in question
mistakable
moot
open to doubt
open to question
problematic
questionable
speculative
suppositional
suspect
suspicious
avowable
cleanable
condensible
enough-but
excus
far-back
fathomable
forgotten
guessable
long-since
nameable
new-coined
over-valued
reclaimable
sniffy
space-to-space
tradeable
unhopeful
upgradable
irrefutable