suspicious (adj.)
- absurd
- agnostic
- apprehensive
- arguable
- borderline
- cagey
- careful
- cautious
- chary
- confutable
- conjectural
- conscienceless
- contestable
- controversial
- controvertible
- corrupt
- corrupted
- criminal
- crooked
- dark
- debatable
- deniable
- devious
- disbelieving
- dishonest
- dishonorable
- disputable
- distrustful
- doubtable
- doubtful
- doubting
- dubious
- dubitable
- envious
- evasive
- felonious
- fishy
- fraudulent
- green
- green-eyed
- guarded
- iffy
- ill-gotten
- immoral
- implausible
- inconceivable
- incredible
- incredulous
- indirect
- insidious
- invidious
- jaundiced
- jealous
- leery
- mistakable
- mistrustful
- moot
- open
- preposterous
- problematic
- queer
- questionable
- questioning
- refutable
- ridiculous
- rotten
- sceptical
- scrupulous
- shady
- shaky
- shameless
- shifty
- shy
- sinister
- skeptical
- slippery
- speculative
- suppositional
- suspect
- suspected
- suspecting
- tall
- thick
- thin
- tricky
- unbelievable
- unbelieving
- uncertain
- unconscientious
- unconscionable
- unconvincing
- underhand
- underhanded
- unearthly
- uneasy
- unethical
- ungodly
- unimaginable
- unpersuadable
- unprincipled
- unsavory
- unscrupulous
- unsure
- unthinkable
- untrusting
- wary
- watchful
- yellow
