dubious (adj.)

• absurd
• agnostic
• ambivalent
• arguable
• beguiling
• capricious
• catchy
• changeable
• confutable
• conjectural
• conscienceless
• contestable
• controversial
• controvertible
• corrupt
• corrupted
• criminal
• crooked
• dark
• debatable
• deceiving
• deceptive
• delusive
• delusory
• deniable
• devious
• dishonest
• dishonorable
• disinclined
• disputable
• distrustful
• doubtable
• doubtful
• doubting
• dubitable
• equivocal
• evasive
• fallacious
• false
• felonious
• fickle
• fishy
• fly-by-night
• fraudulent
• hallucinatory
• hesitant
• iffy
• ill-gotten
• illusive
• illusory
• immoral
• implausible
• improbable
• inconceivable
• incredible
• incredulous
• indecisive
• indirect
• insecure
• insidious
• irresolute
• leery
• mercurial
• misleading
• mistakable
• mistrustful
• moot
• mutable
• open
• preposterous
• problematic
• questionable
• questioning
• refutable
• reluctant
• ridiculous
• rocky
• rotten
• scrupulous
• shady
• shaky
• shameless
• shifty
• shy
• sinister
• skeptical
• slippery
• speculative
• suppositional
• suspect
• suspecting
• suspicious
• tall
• thick
• thin
• tottery
• treacherous
• tricksy
• tricky
• unbelievable
• uncertain
• unclear
• unconscientious
• unconscionable
• unconvincing
• undecided
• undependable
• underhand
• underhanded
• undetermined
• unearthly
• unethical
• ungodly
• unhealthy
• unimaginable
• unlikely
• unpredictable
• unprincipled
• unpromising
• unreliable
• unresolved
• unsafe
• unsavory
• unscrupulous
• unsettled
• unsound
• unstable
• unsteady
• unsure
• unthinkable
• untrusting
• untrustworthy
• untrusty
• wary