alleged
apocryphal
debatable
deniable
doubtful
dubious
dubitable
equivocal
fishy
funny
impugnable
in question
problematic
problematical
self-styled
shady
so-called
soi-disant
supposed
suspect
suspicious
a bit thick
a bit thin
absurd
ambiguous
amoral
arguable
at issue
beguiling
beyond belief
borderline
catchy
confutable
conjectural
conscienceless
contestable
controversial
controvertible
corrupt
corrupted
criminal
crooked
dark
deceiving
deceptive
delusive
delusory
devious
dishonest
dishonorable
disputable
doubtable
evasive
fallacious
false
felonious
acceptable
erroneous
exceptional
improper
legitimate
personal
risky
undesirable
unquestionable