mighty

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having or showing great power, skill, strength, or force: a mighty orator; a mighty blow.
2. adj. Imposing or awesome in size, degree, or extent: a mighty stone fortress.
3. adv. Informal To a great degree; extremely. Used as an intensive: mighty fine; mighty tired. See Regional Note at powerful.

Century Dictionary and Cyclopedia

1. Possessed of or endowed with might; having much ability, strength, or power; eminently strong, powerful, or great: as, a mighty conqueror; a mighty intellect; a man mighty in argument.
2. Marked by or manifesting might; very great, important, or momentous; of uncommon force, consequence, size, number, etc.
3. Vast, enormous, immense, huge, stupendous, monstrous; violent, vehement, impetuous.
4. In a great degree; very; exceedingly: as, mighty wise; mighty thoughtful.

Wiktionary

1. n. Influential, powerful beings.
2. adj. Very strong, possessing might.
3. adj. Very heavy and powerful
4. adj. excellent, extremely good
5. adv. colloquial Very; to a high degree.

GNU Webster's 1913

1. adj. Possessing might; having great power or authority.
2. adj. Accomplished by might; hence, extraordinary; wonderful.
3. adj. Denoting an extraordinary degree or quality in respect of size, character, importance, consequences, etc.
4. n. R. & Obs. A warrior of great force and courage.
5. adv. colloq. In a great degree; very.

WordNet 3.0

1. adj. having or showing great strength or force or intensity
2. adv. (Southern regional intensive) very; to a great degree