adjective, might·i·er, might·i·est.

having, characterized by, or showing superior power or strength: mighty rulers.
of great size; huge: a mighty oak.
great in amount, extent, degree, or importance; exceptional: a mighty accomplishment.


Informal. very; extremely: I'm mighty pleased.


(used with a plural verb) mighty persons collectively (usually preceded by the): the rich and the mighty.

Origin of mighty

before 900; Middle English; Old English mihtig. See might2, -y1
Related formsmight·i·ness, nouno·ver·might·y, adjectivequa·si-might·y, adjective

Synonyms for mighty

1. strong, puissant. See powerful. 2. immense, enormous, tremendous, sizable.

Antonyms for mighty

1. feeble. 2. small.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mighty

Contemporary Examples of mighty

Historical Examples of mighty

  • Then I heard a mighty voice, that seemed to proceed from within the Parthenon.


    Lydia Maria Child

  • It increases in strength and warmth, blowing with a mighty roar.

    The Spenders

    Harry Leon Wilson

  • I tell you, it's a mighty good thing we got your brains to depend on.

    The Spenders

    Harry Leon Wilson

  • It was a mighty voice lifted for right and against oppression.

    The Grand Old Man

    Richard B. Cook

  • In this mighty enterprise, the cow shall be my great confederate.

British Dictionary definitions for mighty


adjective mightier or mightiest

  1. having or indicating might; powerful or strong
  2. (as collective noun; preceded by the)the mighty
very large; vast
very great in extent, importance, etc


informal, mainly US and Canadian (intensifier)he was mighty tired
Derived Formsmightiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mighty

Old English mihtig, earlier mæhtig, from miht (see might (n.)). Cf. Old Frisian mechtig, Old Saxon mahtig, Dutch machtig, German mächtig. As an adverb, it is attested from c.1300, though now considered colloquial.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with mighty


see high and mighty.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.