flabbergasted

• I was floored, just completely flabbergasted that these adults regarded him as an adult, and Aaron stood up there in front of a whole audience full of people, and just started talking about the platform that he'd created for Creative Commons,
  ‫لقد صُعقت! انصرعت تماما، من أن هؤلاء البالغين كانوا يعاملونه على أنّه بالغ ‫وقف هارون أمام جمهور حاشد و أخذ يتكلم ببساطة