1. Not easily bent; stiff or rigid. See stiff.
2. Incapable of being changed; unalterable: an inflexible rule.
3. Refusing to change one's attitude, purpose, or principles; immovable: an inflexible disciplinarian.
in·flex′i·bili·ty, in·flexi·ble·ness n.
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.