senile

[see-nahyl, -nil, sen-ahyl]
adjective
1.
showing a decline or deterioration of physical strength or mental functioning, especially short-term memory and alertness, as a result of old age or disease.
2.
of or belonging to old age or aged persons; gerontological; geriatric.
3.
Physical Geography. (of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level. Compare peneplain.
noun
4.
a senile person.

Origin:
1655–65; < Latin senīlis old, equivalent to sen(ex) old man (akin to senior) + -īlis -ile

unsenile, adjective
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World English Dictionary
senile (ˈsiːnaɪl)
 
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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Etymonline
Word Origin & History

senile
1661, "suited to old age," from Fr. sénile, from L. senilis "of old age," from senex (gen. senis) "old, old man," from PIE base *sen- "old" (cf. Skt. sanah "old;" Avestan hana- "old;" O.Pers. hanata- "old age, lapse of time;" Armenian hin "old;" Gk. enos "old, of last year;" Lith. senas "old,"
senis "an old man;" Goth. sineigs "old" (used only of persons), sinistra "elder, senior;" O.N. sina "dry standing grass from the previous year;" O.Ir. sen, O.Welsh hen "old"). Meaning "weak or infirm from age" is first attested 1848.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

senile se·nile (sē'nīl', sěn'īl')
adj.

  1. Relating to, characteristic of, or resulting from old age.

  2. Exhibiting the symptoms of senility, as impaired memory or the inability to perform certain mental tasks.

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
The quaint idea of comparing reading a book in bed to having a computer in bed
  with you is charmingly senile.
The sad senile fool would rather burn down his own country than to step down.
Senile dementia has been around for as long as people have had the means of
  recording it.
However, a form of secondary amyloidosis called senile amyloidosis involves the
  heart and blood vessels.
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