adj. un·earth·li·er, un·earth·li·est
1. Not of this earth; preternatural; supernatural.
2. Unnaturally strange and frightening. See Synonyms at weird.
3. Ridiculously unreasonable or uncustomary; absurd: called me at an unearthly hour.
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.