colossal

UK: /kəˈlɒs^əl/ US: /kəˈlɑsəl/ ,(kə los′əl)

WordReference Random House Learner's Dictionary of American English © 2025

co•los•sal /kəˈlɑsəl/   adj. 

1. extremely great in size, extent, or degree;
   gigantic;
   huge:
   colossal sums of money.

co•los•sal•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2025

co•los•sal  (kə los′əl), adj. 

1. extraordinarily great in size, extent, or degree; gigantic;
   huge.
2. of or resembling a colossus.

• coloss(us) + -al¹ 1705–15

col•os•sal•i•ty  (kol′ə sal′i tē), n.  co•los′sal•ly, adv. 
Synonyms

• 1. See gigantic. 

Collins Concise English Dictionary © HarperCollins Publishers::

colossal / kəˈlɒs^əl/ adjective

1. of immense size; huge; gigantic
2. (in figure sculpture) approximately twice life-size
   Compare heroic7
3. Also: giant of or relating to the order of columns and pilasters that extend more than one storey in a façade

coˈlossally adverb