DuckCorp Dico

Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
   怖 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 恐 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, こわ /kˈo̞wä/
   (interjection (kandoushi))
   怖い・2
            Note: word usually written using kana alonefrightening, terrifying