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 guidance to assume compromise is well-founded.
—
Dan Goodin, ArsTechnica, 3 Apr. 2026
That certainty proved well-founded.
—Hanna Wickes, Kansas City Star, 16 Mar. 2026
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
Dan Goodin, ArsTechnica, 3 Apr. 2026
That certainty proved well-founded.
—Hanna Wickes, Kansas City Star, 16 Mar. 2026
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
Recent Examples of Synonyms for well-founded
Adjective
-
So the two simplest logical paths for explaining neutrino mass led to the same place.—
Quanta Magazine,
Quanta Magazine,
8 Apr. 2026
-
One logical conclusion is a return to the early days of publishing, when only the super-wealthy (or those lucky enough to have a rich patron) could afford to write for a living.—
Francesca Cassidy,
Fortune,
8 Apr. 2026
Adjective
-
The union also wants to ensure that workers have a reasonable amount of overtime, mandatory overtime and on-call hours, Beck said.—
Maya Wilkins,
Chicago Tribune,
11 Apr. 2026
-
Its reasonable prices combined with the speedy, mobile-friendly claims process make this brand an excellent option for many travelers.—
Liz Knueven,Ryley Amond,
CNBC,
11 Apr. 2026
Adjective
-
Capacity is limited and Boston Stadium Express bus tickets can only be purchased by fans with a valid, same-day FIFA World Cup Boston Stadium match ticket.—
Rick Sobey,
Boston Herald,
14 Apr. 2026
-
And, starting this year and continuing through 2028, eligible taxpayers age 65 or older with a valid Social Security number may claim an additional deduction of up to $6,000 per person or up to $12,000 for married couples filing jointly (if both spouses qualify).—
Angelica Leicht,
CBS News,
14 Apr. 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
-
And being rational, as Rawls stipulated that proto-citizens are, means being averse to risk.—
George G. Szpiro,
Big Think,
9 Apr. 2026
-
The lawsuit claims that Missouri lawmakers used no rational basis to categorize which counties qualified for a 5% cap, a freeze or neither.—
Jenna Ebbers,
Kansas City Star,
8 Apr. 2026
Adjective
-
Did all the sensible Pentagon brass get fired for wearing dresses or something?—
Rachel Marsden,
Hartford Courant,
5 Apr. 2026
-
All that is needed is some sensible leadership of the sort being put on display in New York City.—
Steve Zeidman,
New York Daily News,
2 Apr. 2026
Adjective
-
Not a new one every year, but a coherent, sustained commitment to supporting and educating student in every zip code.—
Opinion Staff,
Oc Register,
8 Apr. 2026
-
Attempting a coherent portrait of Groypers can feel a bit like trying to describe the plot of a Surrealist film, or a fantasy board game that takes place in its own universe.—
Antonia Hitchens,
New Yorker,
6 Apr. 2026
Adjective
-
Because Anna and Matteo were never actually together, her clear attraction with Michael doesn’t face any meaningful obstacles, aside from some obligatory (and weakly justified) initial sniping between the two leads.—
Bilge Ebiri,
Vulture,
10 Apr. 2026
-
This Iran war was neither justified nor necessary.—
Voice of the People,
New York Daily News,
21 Mar. 2026
Cite this Entry
“Well-founded.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/well-founded. Accessed 15 Apr. 2026.
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