se·nil·i·ty

[si-nil-i-tee]
noun
the state of being senile, especially the weakness or mental infirmity of old age.

Origin:
1770–80; senile + -ity

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World English Dictionary
senile (ˈsiːnaɪl) [Click for IPA pronunciation guide]
 
adj
1.  of, relating to, or characteristic of old age
2.  mentally or physically weak or infirm on account of old age
3.  See old (of land forms or rivers) at an advanced stage in the cycle of erosion
 
[C17: from Latin senīlis, from senex an old man]
 
'senilely
 
adv
 
senility
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Senility is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
American Heritage
Medical Dictionary

senility se·nil·i·ty (sĭ-nĭl'ĭ-tē)
n.

  1. The state of being senile.

  2. 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.
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Example sentences
Senility-an ever more and more amiable senility-descended.
He helped establish, for example, that senility is not inevitable with aging.
She'd want to know how doctors ended up curing cancer and senility.
By this time the once-bubbling actor had aged into senility.
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