the state of being senile, especially the weakness or mental infirmity of old age.

Origin of senility

First recorded in 1770–80; senile + -ity Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for senility

Contemporary Examples of senility

Historical Examples of senility

  • Not of age—merely of time; for here was no senility, no quavering or fretful lines.

    The Spenders

    Harry Leon Wilson

  • "Glad your senility has not affected that remnant of your common-sense," he declared.

    Kent Knowles: Quahaug

    Joseph C. Lincoln

  • Is it a sign of senility, or half-thought-out ideas, or what?



  • There's a similar touch of ineptitude (senility, perhaps) in the Memorabilia, ad fin.



  • And this is the man they accuse of senility and weak intellect!

Word Origin and History for senility

1753, from senile + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for senility




The state of being senile.
The mental and physical deterioration characteristic of old age.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.