astounding

UK: /əˈstaʊndɪŋ/ US: /əˈstaʊndɪŋ/ ,(ə stoun′ding)

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

as•tound•ing /əˈstaʊndɪŋ/  adj. 

1. causing great amazement or surprise;
   astonishing:
   an astounding feat of strength.
as•tound•ing•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2026

as•tound•ing  (ə stoun′ding), adj. 

1. capable of overwhelming with amazement;
   stunningly surprising.

• astound + -ing² 1580–90

as•tound′ing•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

astounding / əˈstaʊndɪŋ/ adjective

1. causing amazement and wonder; bewildering

aˈstoundingly adverb

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

as•tound /əˈstaʊnd/   v. [~ + object]

1. to overwhelm with amazement;
   astonish:
   We were astounded by this amazing feat.

WordReference Random House Unabridged Dictionary of American English © 2026

as•tound  (ə stound′), v.t. 

1. to overwhelm with amazement;
   astonish greatly;
   shock with wonder or surprise.

adj. 

2. [Archaic.] astonished;
   astounded.

• Middle English astoun(e)d, past participle of astonen, variant of astonyen to astonish 1275–1325

as•tound′ment, n. 
Synonyms

• 1. See surprise. 

Collins Concise English Dictionary © HarperCollins Publishers::

astound / əˈstaʊnd/ verb

1. (transitive) to overwhelm with amazement and wonder; bewilder

Etymology: 17th Century: from astoned amazed, from Old French estoné, from estoner to astonish