1. Not held in check; unrestrained: an unchecked flow of water; an unchecked temper.
2. Not checked for accuracy, efficiency, or flaws: an unchecked list.
3. Informal Of or relating to a square in a crossword that is part of only one word instead of two.
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.