Persevering and constant in effort or application; assiduous. See Synonyms at diligent.
[From Latin sēdulus, from sēdulō, zealously : sē, without; see s(w)e- in the Appendix of Indo-European roots + dolō, ablative of dolus, trickery (probably from Greek dolos, cunning; see del-2 in the Appendix of Indo-European roots).]
sed′u·lous·ness, se·duli·ty (sĭ-dlĭ-tē, -dy-) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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:
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.