mighty

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having or showing great power, skill, strength, or force.
• adjective Imposing or awesome in size, degree, or extent.
• adverb To a great degree; extremely. Used as an intensive.

from The Century Dictionary.

• In a great degree; very; exceedingly: as, mighty wise; mighty thoughtful.
• 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.
• Marked by or manifesting might; very great, important, or momentous; of uncommon force, consequence, size, number, etc.
• Vast, enormous, immense, huge, stupendous, monstrous; violent, vehement, impetuous.

from the GNU version of the Collaborative International Dictionary of English.

• noun R. & Obs. A warrior of great force and courage.
• adverb colloq. In a great degree; very.
• adjective Possessing might; having great power or authority.
• adjective Accomplished by might; hence, extraordinary; wonderful.
• adjective Denoting an extraordinary degree or quality in respect of size, character, importance, consequences, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Influential, powerful beings.
• adjective Very strong, possessing might.
• adjective Very heavy and powerful
• adjective excellent, extremely good
• adverb colloquial Very; to a high degree.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective having or showing great strength or force or intensity
• adverb (Southern regional intensive) very; to a great degree