senile
adjective
[ ˈsiːnʌɪl ]
• (of a person) having or showing the weaknesses or diseases of old age, especially a loss of mental faculties.
• "she couldn't cope with her senile husband"
Similar:
doddering,
doddery,
decrepit,
aged,
long in the tooth,
senescent,
failing,
declining,
infirm,
feeble,
unsteady,
in one's dotage,
losing one's faculties,
in one's second childhood,
mentally confused,
suffering from senile dementia,
past it,
gaga,
soft in the head,
anile,
Opposite:
in the prime of life,
Origin:
mid 17th century: from French sénile or Latin senilis, from senex ‘old man’.
