utterly unconcerned about the consequences of some action; without caution; careless (usually followed by of ): to be reckless of danger.
characterized by or proceeding from such carelessness: reckless extravagance.

before 900; Middle English rekles, Old English reccelēas careless (cognate with German ruchlos); see reck, -less

recklessly, adverb
recklessness, noun

feckless, reckless.

1. rash, heedless, incautious, negligent, imprudent.

1. careful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reckless (ˈrɛklɪs)
having or showing no regard for danger or consequences; heedless; rash: a reckless driver; a reckless attempt
[Old English recceleās (see reck, -less); related to Middle Dutch roekeloos, Old High German ruahhalōs]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. receleas "careless, thoughtless, heedless," earlier reccileas, from -leas "-less" + *rece, recce "care, heed," from reccan "to care," from W.Gmc. *rokijanan (cf. O.N. rækja "to care for," O.H.G. giruochan "to care for, have regard to," Ger. geruhen "to deign," which is infl. by ruhen "to rest").
No known cognates outside Gmc. The same affixed form is in Ger. ruchlos, Du. roekeloos "wicked." Root verb reck (O.E. reccan) is passing into obscurity. The -k- sound is probably a northern influence from O.N. cognate roekja.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My husband is one of those mad chemists of the culinary world who fling
  ingredients around with reckless abandon.
Some of those academic librarians are sure a wild, crazy and reckless bunch
  with their latest trends in information technology.
So to hand these companies yet more subsidies will only encourage the reckless
  behavior which led to this point.
And there are, even more so, reckless people in this world who don't much care
  about human life.
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