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From The Collaborative International Dictionary of English v.0.48:
Reckless \Reck"less\, a. [AS. reccele['a]s, r[=e]cele['a]s.] 1. Inattentive to duty; careless; neglectful; indifferent. --Chaucer. [1913 Webster] 2. Rashly negligent; utterly careless or heedless. [1913 Webster] It made the king as reckless as them diligent. --Sir P. Sidney. [1913 Webster] Syn: Heedless; careless; mindless; thoughtless; negligent; indifferent; regardless; unconcerned; inattentive; remiss; rash. [1913 Webster] -- Reck"less*ly, adv. -- Reck"less*ness, n. [1913 Webster]