suspicious, dubious, doubtful, dodgy, suspicious (referring to a potential amorous relation), dangerous (e.g. financial situation), ominous (e.g. weather), strange, shady, fishy
charming, bewitching, mysterious
suspicious; dubious; questionable; dodgy; shady; fishy
doubtful; unsure; uncertain; unlikely; implausible
untrustworthy; unreliable; clumsy; awkward; shaky; poor
strange; weird; eerie; spooky; uncanny