1
as in logical
according to the rules of logic
even a well-founded argument can lead to an erroneous conclusion if one of the premises is incorrect
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in reasonable
based on sound reasoning or information
a well-founded complaint about the business's treatment of its customers
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of well-founded
The next few weeks will show if that confidence is well-founded.
—
Tim McDonnell, semafor.com, 19 Feb. 2026
Their concern—well-founded—is that college has become an increasingly expensive pathway to success.
—Neetu Arnold, Washington Post, 10 Feb. 2026
These fears are well-founded, as authorities have previously executed many protesters following grossly unfair trials, while many others remain on death row.
—Hamid Kashani, Twin Cities, 5 Feb. 2026
His concern now seems well-founded.
—Chris Murphy, Vanity Fair, 29 Jan. 2026
In the settlement agreement, Ceratizit neither admits liability nor concedes that the government’s claims are well-founded.
—Desiree Mathurin
december 19, Charlotte Observer, 19 Dec. 2025
And that uncertainty may be well-founded, because according to The Athletic national baseball writer and former MLB general manager Jim Bowden, there's another All-Star second baseman in the division who could make sense for New York.
—Jon Vankin, MSNBC Newsweek, 26 Oct. 2025
That fear was probably well-founded.
—Ryan Whitwam, ArsTechnica, 5 Sep. 2025
One of these targets was to define a sound and well-founded strategy for Calik Denim to become a carbon-neutral company.
—Angela Velasquez, Sourcing Journal, 28 Aug. 2025
Tim McDonnell, semafor.com, 19 Feb. 2026
Their concern—well-founded—is that college has become an increasingly expensive pathway to success.
—Neetu Arnold, Washington Post, 10 Feb. 2026
These fears are well-founded, as authorities have previously executed many protesters following grossly unfair trials, while many others remain on death row.
—Hamid Kashani, Twin Cities, 5 Feb. 2026
His concern now seems well-founded.
—Chris Murphy, Vanity Fair, 29 Jan. 2026
In the settlement agreement, Ceratizit neither admits liability nor concedes that the government’s claims are well-founded.
—Desiree Mathurin
december 19, Charlotte Observer, 19 Dec. 2025
And that uncertainty may be well-founded, because according to The Athletic national baseball writer and former MLB general manager Jim Bowden, there's another All-Star second baseman in the division who could make sense for New York.
—Jon Vankin, MSNBC Newsweek, 26 Oct. 2025
That fear was probably well-founded.
—Ryan Whitwam, ArsTechnica, 5 Sep. 2025
One of these targets was to define a sound and well-founded strategy for Calik Denim to become a carbon-neutral company.
—Angela Velasquez, Sourcing Journal, 28 Aug. 2025
Recent Examples of Synonyms for well-founded
Adjective
-
Whether your companion’s vibe is emotional or logical, try to harmonize with it.—
Tarot.com,
Baltimore Sun,
18 Feb. 2026
-
Bruce Meyer, the union’s deputy executive director and lead negotiator, would be the most logical successor.—
Bill Shaikin,
Los Angeles Times,
18 Feb. 2026
Adjective
-
The prosecution detailed nine separate errors made by Plamberger during the climb—from failing to bring bivy gear to failing to abide by a reasonable turnaround time—which collectively suggest a charge of gross negligence.—
Owen Clarke,
Outside,
21 Feb. 2026
-
Counties with moratoriums Counties use moratoriums to buy time to write new zoning and regulation for wind and solar farms, sometimes to craft reasonable laws and sometimes to craft bans.—
Elizabeth Weise,
USA Today,
21 Feb. 2026
Adjective
-
The camp’s current license is valid until March 6, according to the suit.—
Emily Foxhall,
Los Angeles Times,
25 Feb. 2026
-
Entrant will need to have a valid X account to enter.—
CBS LA Staff,
CBS News,
24 Feb. 2026
Adjective
-
None are credible challengers; Matt Conroy is the more reasoned and moderate of the three.—
The Editorial Board,
Chicago Tribune,
11 Feb. 2026
-
This is a time for cool, calm and reasoned debate, and for legislators to think through the consequences of legislation put forth.—
Bobby Zirkin,
Baltimore Sun,
15 Jan. 2026
Adjective
-
Unlike the city of Poway, which favors hitching posts over parking meters, San Diego has elected to ignore all rational analyses of parking fee options, in favor of looking at parking as a cash cow.—
Harvey Levine,
San Diego Union-Tribune,
18 Feb. 2026
-
In 2026, China’s luxury sector is more selective, rational, and emotionally discerning than ever.—
Yiling Pan,
Vogue,
17 Feb. 2026
Adjective
-
However, the high price point is less sensible.—
Caroline Hughes,
Travel + Leisure,
17 Feb. 2026
-
Saka was substituted at half-time — a sensible move given the tie was won and Arsenal have two Premier League games next week, including a north London derby away against Tottenham.—
James McNicholas,
New York Times,
15 Feb. 2026
Adjective
-
Texas needs a coherent, regulated framework.—
Eleanor Dearman,
Fort Worth Star-Telegram,
14 Feb. 2026
-
Every player had chosen a new note, no one had consulted, and yet the sound was ringingly coherent.—
Literary Hub,
Literary Hub,
13 Feb. 2026
Adjective
-
Sweet Venus enters your thoughtful sign, empowering you with justified confidence in your powers of attraction.—
Tarot.com,
Hartford Courant,
10 Feb. 2026
-
The Justice Department did not respond to a request for comment, but officials there have broadly defended the department’s actions as not only justified but necessary for ensuring the rule of law and holding alleged criminals to account.—
Kevin Rector,
Los Angeles Times,
31 Jan. 2026
Cite this Entry
“Well-founded.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/well-founded. Accessed 25 Feb. 2026.
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