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.

Adjective

(en-adj)

Without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

It was a surprise to see the captain, who had always seemed so serious , laugh so heartily.

Important; weighty; not trifling; leaving no room for play; needing great attention; critical.

This is a serious problem. We'll need our best experts.

Really intending what is said; being in earnest; not jesting or deceiving; meaningful.

After all these years, we're finally getting serious attention.