Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Capable of making an error: Humans are only fallible.
  • adj. Tending or likely to be erroneous: fallible hypotheses.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Capable of making mistakes or being wrong.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Liable to fail, mistake, or err; liable to deceive or to be deceived

from The Century Dictionary and Cyclopedia

  • Liable to err; capable of being or apt to be deceived or mistaken: said of persons.
  • Liable to be erroneous or false; subject to inaccuracy or fallaciousness: said of arguments, statements, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
  • adj. likely to fail or make errors

Etymologies

Middle English, from Medieval Latin fallibilis, from Latin fallere, to deceive.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin fallibilis ("liable to err, also deceitful"), from Latin fallere ("to deceive"). (Wiktionary)

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