Failure to use care which a reasonable and prudent person would use under similar circumstances.

Source: U.S. Courts

The failure to exercise the care, prudence, or attention to duties which the interests of the government require to be exercised by a prudent and reasonable person under the circumstances.

Source: Judge Advocate General

When someone fails to be as careful as the law requires to protect the rights and property of others.

Source: California Courts.

Failure to act in a manner that is reasonably prudent; failure to exercise the appropriate degree of care under given circumstances.

Source: Missouri Department of Insurance