We found 18 dictionaries that define the word frightfulness:

General (15 matching dictionaries)

1. frightfulness: Merriam-Webster
2. frightfulness: Oxford Learner's Dictionaries
3. frightfulness: Collins English Dictionary
4. frightfulness: Vocabulary.com
5. frightfulness: Wordnik
6. frightfulness: Wiktionary
7. Frightfulness, frightfulness: Dictionary.com
8. Frightfulness: Online Plain Text English Dictionary
9. frightfulness: Webster's Revised Unabridged, 1913 Edition
10. frightfulness: Rhymezone
11. Frightfulness: AllWords.com Multi-Lingual Dictionary
12. frightfulness: Webster's 1828 Dictionary
13. frightfulness: FreeDictionary.org
14. frightfulness: Mnemonic Dictionary
15. frightfulness: TheFreeDictionary.com

Business (1 matching dictionary)

16. frightfulness: Legal dictionary

Computing (1 matching dictionary)

17. frightfulness: Encyclopedia

Medicine (1 matching dictionary)

18. frightfulness: Medical dictionary

(Note: See frightful as well.)

Definitions from Wiktionary (frightfulness) ▸ noun:  The quality of being frightful. Similar: frightsomeness, frightenedness, terrifiedness, terrifyingness, fearsomeness, fearfulness, dreadfulness, gruesomeness, horrendousness, scariness, more... Opposite: innocuous, harmless, benign, gentle, mild Types: horror, terror, scare, fear, dread, alarm, consternation, more... ▸ Words similar to frightfulness ▸ Usage examples for frightfulness ▸ Idioms related to frightfulness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing frightfulness ▸ Words that often appear near frightfulness ▸ Rhymes of frightfulness ▸ Invented words related to frightfulness