Find Antonyms

cosponsor Antonyms

Opposite of cosponsor

Because the opposite of cosponsor shifts with each meaning, the antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
JUMP TO:

• noun (Context 1)

A person, organization, or legislator that joins with one or more others to propose, finance, or officially back a legislative bill, event, or project.

Usage Example

"The senator agreed to become a lead opponent of the bipartisan infrastructure bill."

Strong
opponent
adversary

• verb (Context 2)

To sponsor, endorse, or finance a legislative bill, event, or initiative jointly with one or more other people or organizations.

Usage Example

"Two local universities will oppose the annual science symposium this autumn."

Strong
oppose
veto

Similar words to cosponsor

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

co-sponsor
sponsor
backer
underwrite
patron
back
supporter
endorse
See all synonyms of cosponsor

• Nearby Words

cosmically
cosmopolitan
cosmos
cosponsor
cosset
cost
costar

Cite this Entry

Wordmom. (2026). Antonyms for Cosponsor. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/cosponsor
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.