n. pl. in·fir·mi·ties
a. The condition of being infirm, often as associated with old age; weakness or frailty: the infirmity brought on by the disease.
b. A bodily ailment or weakness: complained about his infirmities.
a. Weakness of resolution or character: the infirmity inherent in human nature.
b. A moral failing or defect in character: the infirmities and depravities of corrupt nobles.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.