What does illegibility mean?
Illegibility is the condition of writing, print, or a document being unreadable or exceptionally difficult to decipher. The noun is especially common in legal and administrative settings, where an illegible signature, handwritten note, or poorly reproduced document may affect the reliability of a record. It can also describe text that is technically present but visually unclear because of poor printing, bad handwriting, low resolution, or damaged materials. In ordinary use, illegibility often suggests a practical problem rather than a deliberate use of secret writing: the information is available, but the reader cannot confidently interpret it. The related adjective is “illegible,” as in an illegible form or an illegible signature, while the adverb “illegibly” describes the manner in which something is written. Understanding the noun is useful in contexts involving records, evidence, publishing, and document design, where clarity and legibility can affect access to information and the authority of a document.
nounThe quality or condition of being illegible, especially the state of writing or text being impossible or very difficult to read. It can also refer to the unreadability of a document, signature, or other written material.
- The quality or condition of being unreadable, especially when referring to writing, print, or handwriting.
- The state of being difficult or impossible to interpret, especially in the case of a document or record.
"The blur made the document's illegibility impossible to ignore."
"The lawyer noted the illegibility of the witness's signature."
"Careful proofreading can help prevent the illegibility of small print."
The plural is grammatically correct but uncommon; the singular is normally preferred in general use.
"The archivists documented several illegibilities in the oldest manuscripts."
Illegibility can turn a routine signature into a mystery: what looks like a flourish may hide an entire name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does illegibility come from?
Illegibility is formed from “illegible,” which combines the Latin prefix il- meaning “not” with the Latin root legibilis, meaning “readable” or “able to be read.” The suffix -ity turns the adjective into a noun expressing the state or quality of being illegible. Its meaning has remained closely connected with writing and printed text, although modern usage also extends it to any material whose meaning is difficult to interpret.
How illegibility is actually used
This is a formal noun, commonly used in legal, academic, administrative, and publishing contexts. It is more specific than general obscurity, since it focuses primarily on writing that cannot readily be read or interpreted.
Easily confused with illegibility
“Illegibility” is the noun naming the condition of being unreadable, whereas “illegible” is the adjective describing writing or text that cannot be read.