disable

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To deprive of capability or effectiveness, especially to impair the physical abilities of.
• transitive verb Law To render legally incapable of performing an act.

from The Century Dictionary.

• To render unable; deprive of ability, physical, mental, or legal; weaken or destroy the capability of; cripple or incapacitate: as, a ship is disabled by a storm or a battle; a race-horse is disabled by lameness; loss of memory disables a teacher.
• To impair; diminish; impoverish.
• To pronounce incapable; hence, to detract from; disparage; undervalue.
• Synonyms To cripple, paralyze, enfeeble, unfit, disqualify.
• Wanting ability; incompetent.

from the GNU version of the Collaborative International Dictionary of English.

• adjective obsolete Lacking ability; unable.
• transitive verb To render unable or incapable; to destroy the force, vigor, or power of action of; to deprive of competent physical or intellectual power; to incapacitate; to disqualify; to make incompetent or unfit for service; to impair.
• transitive verb (Law) To deprive of legal right or qualification; to render legally incapable.
• transitive verb obsolete To deprive of that which gives value or estimation; to declare lacking in competency; to disparage; to undervalue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive To render unable; to take away an ability of.
• verb To impair the physical or mental abilities of; to cause a serious, permanent injury.
• verb to deactivate a function of an electronical or mechanical device.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb injure permanently
• verb make unable to perform a certain action