The Japanese adjective '怪しい (あやしい)' primarily means 'suspicious'. It is used to describe something or someone that seems dubious, questionable, or not entirely trustworthy. This can apply to situations, objects, or people. For example: That person looks suspicious「あの人は怪しい」(あのひとはあやしい). The story sounds suspicious「その話は怪しい」(そのはなしはあやしい). Additionally, '怪しい' can sometimes imply a sense of mystery or the supernatural, as in: The old house looks eerie「その古い家は怪しい」(そのふるいいえはあやしい). The nuance of the word can vary depending on context, but it generally conveys a sense of doubt or unease.