- (a.) Full of that which causes fright; exciting alarm; impressing terror; shocking; as, a frightful chasm or tempest; a frightful appearance.
- (a.) Full of fright; affrighted; frightened.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). frightful. Retrieved September 24, 2026, from http://smartdefine.org/frightful/definitions/2010250 |
| Chicago | Webster's. 2011. "frightful" http://smartdefine.org/frightful/definitions/2010250 (accessed September 24, 2026). |
| Harvard | Webster's 2011, frightful, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/frightful/definitions/2010250>. |
| MLA | Webster's. "frightful" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/frightful/definitions/2010250> |