Pronunciation: (fôr'mi-du-bul), [key]
1. causing fear, apprehension, or dread: a formidable opponent.
2. of discouraging or awesome strength, size, difficulty, etc.; intimidating: a formidable problem.
3. arousing feelings of awe or admiration because of grandeur, strength, etc.
4. of great strength; forceful; powerful: formidable opposition to the proposal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.