Find Antonyms

ultrafast Antonyms

Opposite of ultrafast

Pinning down the opposite of ultrafast requires matching its exact sense, so the antonyms and opposite words below are paired with a clear adjective definition and ranked by contrast strength.
JUMP TO:

• adjective (Context 1)

Extremely fast; moving, operating, or occurring at an exceptionally high speed, especially in computing, telecommunications, or laser physics.

Usage Example

"The new fiber-optic network provides ultraslow internet speeds to rural communities."

Strongest
ultraslow
sluggish
Strong
slow
crawling
leisurely

Similar words to ultrafast

Words similar to ultrafast shift depending on context. Common synonyms include:

superfast
hyperfast
high-speed
lightning-fast
breakneck
blistering
rapid
swift
See all synonyms of ultrafast

• Nearby Words

ultraexclusive
ultraexpensive
ultrafashionable
ultrafast
ultrafeminine
ultrafine
ultrahigh

Cite this Entry

Wordmom. (2026). Antonyms for Ultrafast. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/ultrafast
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.