English translation of '茫然'

形

1. at a loss
   ⇒ 给他解释了半天,他还是茫然地望着我。 (Gěi tā jiěshìle bàntiān, tā háishì mángrán de wàngzhe wǒ.) I took a long time explaining it to him but he still stared at me blankly.