hard

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hard

1. Chem (of water) impairing the formation of a lather by soap
2. (of alcoholic drink) being a spirit rather than a wine, beer, etc.
3. (of a drug such as heroin, morphine, or cocaine) highly addictive
4. Physics (of radiation, such as gamma rays and X-rays) having high energy and the ability to penetrate solids
5. Physics (of a vacuum) almost complete
6. Chiefly US (of goods) durable
7. politically extreme
8. Brit a roadway across a foreshore
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

hard

[härd]
(materials)
Quality of a material that is compact, solid, and difficult to deform.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in classic literature ?
"She can't ha' done it," he said, still without moving his eyes, as if he were only talking to himself: "it was fear made her hide it...I forgive her for deceiving me...I forgive thee, Hetty...thee wast deceived too...it's gone hard wi' thee, my poor Hetty...but they'll never make me believe it."
I'm soft in my muscles, and my mind's gone hard. I used to respect men.
White Fang was too helpless to defend himself, and it would have gone hard with him had not Grey Beaver's foot shot out, lifting Lip-lip into the air with its violence so that he smashed down to earth a dozen feet away.