noun · 5 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
/səˈnɪlɪti/
Southern-England:Recorded audio is listed in the source snapshot.
rhymes with -ɪlɪti
CMU ARPABET:S AH0 N IH1 L AH0 T IY0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The bodily and mental deterioration associated with old age: Synonym of senescence.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
Examples
Near-synonym: second childhood
Meaning relationships
Synonyms: second childhood
Antonyms: juvenescence, juvenility
2
noun
Meaning 2
The losing of memory and reason due to senescence.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
Examples
He was entering his years of senility and not liking it a bit.
Meaning relationships
Synonyms: none provided
Antonyms: juvenility
3
noun
Meaning 3
An elderly, senile person.
Definition source: English Wiktionary via Wiktextract
Usage: archaic, countable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: juvenile
4
noun
Meaning 4
the state of being senile
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: oldness
5
noun
Meaning 5
mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: dotage, second childhood
Antonyms: none provided
Broader terms: old age, years, age, eld, geezerhood
History
Etymology
Etymology tree English senile Proto-Indo-European *-teh2 Proto-Indo-European *-ts Proto-Indo-European *-teh2ts Latin -itāsder. Old French -itebor. Middle English -ite English -ity English senility From senile + -ity.
Across languages
Translations
26 source translations are retained for this English entry.
Breton:
kabac'hded
— the losing of memory and reason
Bulgarian:
сенилност
(senilnost)
— the losing of memory and reason
Bulgarian:
изкуфялост
(izkufjalost)
— the losing of memory and reason
Catalan:
senilitat
— the losing of memory and reason
Chinese:
痴呆
(chidai)
— the losing of memory and reason
Dutch:
seniliteit
— the losing of memory and reason
Finnish:
vanhuudenhöperyys
— the losing of memory and reason
Finnish:
seniiliys
— the losing of memory and reason
French:
sénilité
— the losing of memory and reason
German:
Senilität
— the losing of memory and reason
Greek:
γεροντική άνοια
(gerontikí ánoia)
— the losing of memory and reason
Italian:
senilità
— the losing of memory and reason
Japanese:
耄碌
(mōroku)
— the losing of memory and reason
Macedonian:
изветреаност
(izvetreanost)
— the losing of memory and reason
Macedonian:
излапеност
(izlapenost)
— the losing of memory and reason
Macedonian:
сенилност
(senilnost)
— the losing of memory and reason
Plautdietsch:
Ellaschwakheit
— the losing of memory and reason
Polish:
starczość
— the losing of memory and reason
Portuguese:
senilidade
— the losing of memory and reason
Romanian:
senilitate
— the losing of memory and reason
Russian:
ста́рость
(stárostʹ)
— the losing of memory and reason
Russian:
дря́хлость
(drjáxlostʹ)
— the losing of memory and reason
Spanish:
senilidad
— the losing of memory and reason
Swedish:
senilitet
— the losing of memory and reason
Tausug:
kalīanan
— the losing of memory and reason
Bulgarian:
старец
(starec)
— an elderly, senile person