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.

Adjective

(er)

Insane; lunatic; demented.

* 1663 , (Samuel Butler), (Hudibras)

Over moist and crazy brains.

* , chapter=5

, title= Mr. Pratt's Patients , passage=Of all the queer collections of humans outside of a crazy asylum, it seemed to me this sanitarium was the cup winner. […] When you're well enough off so's you don't have to fret about anything but your heft or your diseases you begin to get queer, I suppose.}}

Out of control.

Overly excited or enthusiastic.

* R. B. Kimball

The girls were crazy to be introduced to him.

In love; experiencing romantic feelings.

(informal) Unexpected; surprising.

Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.

* Macaulay

Piles of mean and crazy houses.

* Addison

One of great riches, but a crazy constitution.

* Jeffrey

They got a crazy boat to carry them to the island.