Reckless Definition

rĕklĭs

adjective

Acting or done with a lack of care or caution; careless or irresponsible.

American Heritage

Careless; heedless.

Webster's New World

Not regarding consequences; headlong and irresponsible; rash.

Webster's New World

The definition of reckless is something that is done foolishly, carelessly, or without thinking about the consequences.

An example of behavior that would be described as reckless driving is driving 110 miles an hour down a highway with a speed limit of 55.

YourDictionary

Synonyms:

Antonyms:

Origin of Reckless

From Middle English rekles, reckeles, from Old English rÄ“celÄ“as (“reckless, careless, negligent"), equivalent to reck +"Ž -less. Cognate with Dutch roekeloos (“reckless"), German ruchlos (“careless, notorious").

From Wiktionary
Middle English reckeles from Old English rēcelēas reg- in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition