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frightful

Short definition from Wiktionary

Adjective

  1. Full of fright, whether: Afraid, frightened.
  2. Full of fright, whether: Timid, fearful, easily frightened.
  3. Full of something causing fright, whether: Genuinely horrific, awful, or alarming.
  4. Full of something causing fright, whether: Unpleasant, dreadful, awful (also used as an intensifier).

Adverb

  1. Frightfully; very.

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