not legible; impossible or hard to read or decipher because of poor handwriting, faded print, etc.: This letter is completely illegible.
Origin of illegible
Related formsil·leg·i·bil·i·ty, il·leg·i·ble·ness, nounil·leg·i·bly, adverb
First recorded in 1605–15; il-2
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for illegibility
Historical Examples of illegibility
Sometimes, owing to the illegibility of the writing, she has to study out sentences.
But there are other faults in writing besides ugliness and illegibility.
There were traces of inscription on it, but eroded to illegibility.
The state license number was gone, and the serial number on the engine had been hammered into illegibility.
A kind of illegibility, though a different kind, stole over Mr Boffin's face.
British Dictionary definitions for illegibility
Derived Formsillegibility or illegibleness, nounillegibly, adverb
unable to be read or deciphered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for illegibility
1630s, from assimilated form of in- (1) "not, opposite of" + legible. Related: Illegibly; illegibility.
Online Etymology Dictionary, © 2010 Douglas Harper