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 mightier

Contemporary Examples of mightier

  • Marty said: “The pen is mightier than the sword, and considerably easier to write with.”

    The Daily Beast logo
    Marty Feldman: Dead Cool

    Simon Doonan

    November 2, 2009

  • According to the former Speaker of the House, the pen is not mightier than the sword... or an electro-magnetic pulse.

    The Daily Beast logo
    7 Best Moments From Sunday Talk

    The Daily Beast Video

    April 5, 2009

Historical Examples of mightier

British Dictionary definitions for mightier


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 mightier



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 mightier


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.