What does fallibilist mean?
A fallibilist is someone who embraces fallibilism, the epistemological view that no belief — however well supported by evidence — can be regarded as absolutely certain, because any claim about the world may ultimately prove mistaken. The term belongs primarily to philosophy, especially epistemology and the philosophy of science, and is associated with thinkers such as Charles Sanders Peirce, who argued that genuine inquiry must remain permanently open to revision. Being a fallibilist does not mean doubting everything indiscriminately; rather, it means holding beliefs confidently but provisionally, treating even the most established conclusions as answerable to new evidence. The word connotes intellectual humility, openness, and rigor, and stands in deliberate opposition to dogmatism and claims of infallibility. Outside academic circles it appears mainly in discussions of science, critical thinking, and rational inquiry, where describing oneself as a fallibilist signals a commitment to evidence over certainty.
nounA person who holds that all human knowledge claims are potentially mistaken and therefore provisional; an adherent of the philosophical doctrine known as fallibilism.
- An adherent of fallibilism — someone who believes that no empirical belief or knowledge claim can be held with absolute certainty, since any of them may turn out to be mistaken.
"As a thoroughgoing fallibilist, she treated every scientific conclusion as open to revision in light of new evidence."
"Peirce, the founder of pragmatism, was a lifelong fallibilist who insisted that genuine inquiry never reaches a point where doubt becomes impossible."
"The panel's fallibilist stance encouraged researchers to publish their methods openly so others could check their work."
Standard English pluralization applies; the plural refers to multiple adherents of fallibilism.
"Most working scientists are implicit fallibilists, treating every theory as open to refutation."
A fallibilist takes intellectual humility to its logical extreme: even our best-established facts might be wrong — including this sentence.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fallibilist
The word derives from the Latin verb "fallere," meaning to deceive or to fail, through the Latin adjective "fallibilis" (capable of deceiving or erring), which entered English as "fallible." The noun "fallibilist" was formed much later, alongside the philosophical term "fallibilism" coined in connection with the ideas of the American philosopher Charles Sanders Peirce in the late nineteenth century. It shares its root with "fallacy," "fallibility," and "fallible."
Related word forms
How fallibilist is actually used
A formal, largely academic term found chiefly in philosophy of science and epistemology. It carries a positive connotation of intellectual humility rather than mere doubt or cynicism — a fallibilist need not be a skeptic about whether knowledge is possible, only about whether it can ever be absolutely certain. Rarely used in casual conversation.
Easily confused with fallibilist
"Fallible" describes something capable of error or being wrong, while a "fallibilist" is a person who adopts the philosophical view that all knowledge claims are subject to such error.