奇怪しい[okashii] funny
怪しからん[keshikaran] outrageous
怪しげ[ayashige] questionable
怪しむ[ayashimu] to suspect
怪異[kaii] strangeness

怪我[kega] injury (to animate object)
怪我人[keganin] wounded or injured person
怪奇[kaiki] bizarre
怪傑[kaiketsu] man of extraordinary talent
怪死[kaishi] mysterious death

怪訝[kegen] dubious
訝しい[ibukashii] suspicious

訝しむ[ibukashimu] to doubt
訝る[ibukaru] to wonder