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Meaning of senile

se•nile

Pronunciation: (sē'nīl, -nil, sen'īl), [key]
— adj.
  1. showing a decline or deterioration of physical strength or mental functioning, esp. short-term memory and alertness, as a result of old age or disease.
  2. of or belonging to old age or aged persons; gerontological; geriatric.
  3. (of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level. Cf.
—n.
  1. a senile person.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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