Adjective

(head)

Not nutritious.

Lacking matter; empty; devoid of substance.

Naive; simplistic.

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Adjective

(en adjective)

Of, or relating to old age.

* {{quote-magazine, year=2013, month=May-June, author= Charles T. Ambrose

, title= Alzheimer’s Disease , volume=101, issue=3, page=200, magazine=(American Scientist) , passage=Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems— […]. Such a slow-release device containing angiogenic factors could be placed on the pia mater covering the cerebral cortex and tested in persons with senile dementia in long term studies.}}

(often, offensive) Exhibiting the deterioration in mind and body often accompanying old age; doddering.