Etymology
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senile (adj.)

1660s, "suited to or characteristic of old age," from French sénile (16c.), from Latin senilis "of old age," from senex (genitive senis) "old, old man" (from PIE root *sen- "old"). The meaning "infirm from age; pertaining to or proceeding from the weakness that usually attends old age" is attested by 1882; senile dementia is attested by 1851.

updated on May 03, 2022

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Definitions of senile from WordNet

senile (adj.)
mentally or physically infirm with age;
Synonyms: doddering / doddery / gaga
From wordnet.princeton.edu, not affiliated with etymonline.