In a senile way, showing the weakness of old age.
This word can make people think of forgetfulness and confusion.
Examples:
He senilely forgot where he put his keys.
She senilely wandered around the house, not knowing where she was.
The old man senilely tried to remember his grandchildren's names.
Grandma senilely put her slippers in the fridge again.
The professor senilely lectured about the wrong subject.
The cat senilely stared at the wall for hours.