English
frightfulness
From frightful + -ness.
A compound of frightful + -ness
Proto-Indo-European *pr̥k- ‘fear’
…
Proto-West Germanic *furht
Old English forht ‘afraid’
Old English forhtfull ‘fainthearted, timorous’
Middle English frightful ‘afraid’
English frightful
Today it means
noun The quality of being frightful.
Language periods are conventional ranges, not dates for this word.
Etymograph / frightfulness