1. Characterized by extremely brutal or cruel crimes; vicious.
2. Infamous; scandalous: "That remorseless government persisted in its flagitious project" (Robert Southey).
[Middle English flagicious, wicked, from Latin flāgitiōsus, from flāgitium, shameful act, protest, from flāgitāre, to importune, to demand vehemently.]
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.