ultrafast

adjective

ul·​tra·​fast ˌəl-trə-ˈfast 

: extremely or extraordinarily fast

ultrafast trains

ultrafast speeds

an ultrafast wireless connection

Examples of ultrafast in a Sentence

Recent Examples on the Web

With efficiency doubled, size slashed, and complexity reduced, this palm-sized laser may reshape how ultrafast optical tools move from the lab into the real world. —Neetika Walter, Interesting Engineering, 6 Nov. 2025

The pack, which is shielded to prevent or limit damage in a collision, is part of an advanced 800-volt architecture for ultrafast DC charging. —IEEE Spectrum, 5 Nov. 2025

Jason Alden | Bloomberg | Getty Images Amazon on Tuesday launched a new ultrafast delivery service in the United Arab Emirates that can ferry groceries, cosmetics, electronics and other household items to shoppers in 15 minutes or less. —Annie Palmer, CNBC, 21 Oct. 2025

Smaller companies enjoy an agility advantage that makes ultrafast growth more attainable. —Nino Paoli, Fortune, 15 Sep. 2025

Word History

First Known Use

1883, in the meaning defined above

Rhymes for ultrafast

• chloroplast
• epiblast
• opencast
• overcast
• protoplast
• rebroadcast
• telecast
• trophoblast
• unsurpassed
• aghast
• amassed
• biassed