bewilder

Concise Oxford English Dictionary © 2008 Oxford University Press:
bewilder/bɪˈwɪldə(r)/

▶verb (often as adj. bewildered) perplex or confuse.

– derivatives
bewilderedly adverb,
bewildering adjective,
bewilderingly adverb,
bewilderment noun.

– origin C17: from be- + obs. wilder ‘lead or go astray’, of unknown origin.