pro·found (prə-found, prō-)
adj. pro·found·er, pro·found·est
1. Having, showing, or requiring great insight or understanding: a profound thinker; a profound analysis.
2. Deeply felt or held; intense: profound contempt; a profound conviction.
3. Thoroughgoing; far-reaching: profound social changes.
4. Unqualified or unbroken: a profound silence; profound sleep.
5. Situated at, extending to, or coming from a great depth; deep: a profound chasm.
[Middle English profounde, from Old French profond, deep, from Latin profundus : prō-, before; see PRO-1 + fundus, bottom.]
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.