|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]|
senile se·nile (sē'nīl', sěn'īl')
Relating to, characteristic of, or resulting from old age.
Exhibiting the symptoms of senility, as impaired memory or the inability to perform certain mental tasks.