bewilderingly

/bɪˈwɪldərɪŋli/
adverb
  1. In a way that is extremely confusing or difficult to understand.
    • The instructions were bewilderingly complex, even for an expert.
    • She found the city's street layout bewilderingly chaotic.
    • The plot of the movie was bewilderingly twisty, leaving the audience lost.
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