1. Conscientious and exact; painstaking. See Synonyms at meticulous.
2. Having scruples; principled.
[Middle English, from Old French scrupuleux, from Latin scrūpulōsus, from scrūpulus, scruple; see SCRUPLE.]
scru′pu·losi·ty (-lŏsĭ-tē), scrupu·lous·ness (-ləs-nĭs) 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:
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.