neglect

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

• transitive verb To pay little or no attention to; fail to heed; disregard.
• transitive verb To fail to care for or attend to properly.
• transitive verb To fail to do or carry out, as through carelessness or oversight.
• noun The act or an instance of neglecting something.
• noun The state or fact of being neglected.
• noun Habitual lack of care.

from The Century Dictionary.

• Neglected.
• To treat carelessly or heedlessly; forbear to attend to or treat with respect; be remiss in attention or duty toward; pay little or no attention to; slight: as, to neglect one's best interests; to neglect one's friends.
• To overlook or omit; disregard: as, the difference is so small that it may be neglected.
• To omit to do or perform; let slip; leave undone; fail through heedlessness to do or in doing (something): often with an infinitive as object.
• . To cause to be neglected or deferred.
• Synonyms Neglect, Disregard, Slight. Slight always expresses intention: it applies to persons or things. Neglect and disregard apply more often to things, and may or may not express intention; disregard is more often intentional than neglect. Only neglect may be followed by an infinitive: as, to neglect to write a letter; among things it generally applies to action that is needed, while disregard commonly applies to failure to heed or notice: as, to disregard counsel, a hint, a request, the lessons of experience, the signs of coming rain; to neglect a duty. See negligent and negligence.
• noun The act of neglecting; the act of treating with slight attention, heedlessness, or disrespect some person or thing that requires attention, care, or respect.
• noun Omission; oversight; the not doing a thing that should or might be done.
• noun Disregard; slight; omission of due attention or civilities.
• noun Negligence; habitual want of regard.
• noun The state of being disregarded.
• noun Synonyms Failure, default, heedlessness.
• noun 1, 3, and Remissness, etc. See negligence.

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

• transitive verb Not to attend to with due care or attention; to forbear one's duty in regard to; to allow to pass unimproved, unheeded, undone, etc.; to omit; to disregard; to slight
• transitive verb To omit to notice; to forbear to treat with attention or respect; to slight.
• noun Omission of proper attention; avoidance or disregard of duty, from heedlessness, indifference, or willfulness; failure to do, use, or heed anything; culpable disregard.
• noun Omission of attention or civilities; slight.
• noun Habitual carelessness; negligence.
• noun The state of being disregarded, slighted, or neglected.
• noun A deliberate policy of minimizing public discussion of a controversial issue [e.g. by the president] on the theory that excessive discussion in itself is harmful or counterproductive.

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

• verb transitive To disregard or pay little attention to something.
• verb transitive To fail to care for, or attend to something.
• verb transitive To fail to do or carry out something due to oversight or carelessness.
• noun The act of neglecting.
• noun The state of being neglected.
• noun Habitual lack of care.

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

• verb fail to do something; leave something undone
• noun lack of attention and due care
• noun willful lack of care and attention
• noun the trait of neglecting responsibilities and lacking concern
• verb give little or no attention to
• verb fail to attend to
• noun the state of something that has been unused and neglected
• verb leave undone or leave out
• noun failure to act with the prudence that a reasonable person would exercise under the same circumstances