1. suspicious; dubious; questionable; dodgy; shady; fishy
2. doubtful; unsure; uncertain; unlikely; implausible
3. untrustworthy; unreliable; clumsy; awkward; shaky; poor
4. strange; weird; eerie; spooky; uncanny
5. ominous (e.g. weather); threatening; dangerous (e.g. financial situation); uncertain
6. suspicious (of a potential amorous relation)
7. mysterious; bewitching; alluring; enticing; enchanting
also 妖しい