1. Not agitated emotionally; calm: remained unruffled throughout the crisis; is known for her unruffled demeanor.
2. Not disordered or disturbed physically: "The big ketch lay motionless on unruffled water; the float line drifted slack" (Robert Stone).
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.