flabbergasted (adj.)

• agape
• aghast
• agog
• amazed
• astonished
• astounded
• awed
• awestruck
• beguiled
• bewildered
• bewitched
• breathless
• captivated
• confounded
• dumbfounded
• dumbstruck
• enchanted
• enraptured
• enthralled
• entranced
• fascinated
• gaping
• hypnotized
• mesmerized
• open-eyed
• openmouthed
• popeyed
• puzzled
• spellbound
• staring
• stupefied
• surprised
• thunderstruck
• wide-eyed
• wonder-struck
• wondering