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in·cred·u·lous (ĭn-krĕjə-ləs)
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adj.
1. Skeptical; disbelieving: incredulous of stories about flying saucers.
2. Expressive of disbelief: an incredulous stare.
[From Latin incrēdulus : in-, not; see IN-1 + crēdulus, believing; see CREDULOUS.]
in·credu·lous·ly adv.
in·credu·lous·ness n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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