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
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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
Thus, the lack of the stimulus rather than the presence of it is the cause of
  risk-taking and recklessness.
And courage was not the product of impulse or recklessness.
The only serious nuclear power accident that has ever occurred was the result
  of outrageous recklessness.
The translators approached their task with characteristic recklessness.
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