What is the meaning of Frightful?

Full of fright, whether

  1. Afraid, frightened.
  2. Timid, fearful, easily frightened.

Afraid, frightened.

Timid, fearful, easily frightened.

Full of something causing fright, whether

  1. Genuinely horrific, awful, or alarming.
  2. Unpleasant, dreadful, awful (also used as an intensifier).

Genuinely horrific, awful, or alarming.

Unpleasant, dreadful, awful (also used as an intensifier).

Frightfully; very.

afraid, frightened

Source: wiktionary.org