Indifferent to or disregardful of consequences: a reckless driver. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "reckless" in a sentence
"Other motorcyclists, more assertive and impatient the word reckless came to mind, began snaking their way in the narrow space between lanes of stopped traffic, as is common here."
"The fracas has put WikiLeaks in the position of decrying what it called the "reckless" and "negligent" disclosure of information—something WikiLeaks' critics have long accused it of doing itself."
"He said the sanctions risked engulfing the Horn of Africa in another cycle of conflict as it might encourage Ethiopia to contemplate what he called "reckless military adventures.""