mightily

UK: /ˈmaɪtɪlɪ/ US: /ˈmaɪtəli/ ,(mīt′l ē)

WordReference Random House Unabridged Dictionary of American English © 2026

might•i•ly  (mīt′l ē), adv. 

1. in a mighty manner;
   powerfully or vigorously.
2. to a great extent or degree;
   very much:
   to desire something mightily.

• bef. 900; Middle English; Old English mihtiglīce. See mighty, -ly

Collins Concise English Dictionary © HarperCollins Publishers::

mightily / ˈmaɪtɪlɪ/ adverb

1. to a great extent, amount, or degree
2. with might; powerfully or vigorously

WordReference Random House Learner's Dictionary of American English © 2026

might•y /ˈmaɪti/   adj., -i•er, -i•est, adv., n. 
adj. 

1. having or showing might:
   mighty rulers.
2. of great size; huge:
   the mighty Mississippi River.
3. great in amount, extent, or importance:
   a mighty accomplishment.

adv. 

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

n. 

5. the mighty, [plural* used with a plural verb] mighty people thought of as a group.

might•i•ly /ˈmaɪtəli/  adv. 
might•i•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026

might•y  (mī′tē), adj., might•i•er, might•i•est, adv., n. 
adj. 

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

adv. 

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

n. 

5. (used with a pl. v.) mighty persons collectively (usually prec. by the):
   the rich and the mighty.

• bef. 900; Middle English; Old English mihtig. See might², -y¹

might′i•ness, n. 
Synonyms

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

Antonyms

• 1. feeble.
• 2. small.