Definition of "thoughtless" []

• Marked by or showing lack of due thought or care; careless. See Synonyms at careless. (adjective)
• Inconsiderate; inattentive: a thoughtless remark. (adjective)
• Lacking thought: The debate turned into thoughtless bickering. (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.

• "There is never a need to deny the harm that ignorance can cause, and use of the term thoughtless usually refers to some action taken without thoughtful consideration."
• "It's what I call thoughtless safety, and it brings you about 3 1-2 per cent, as I have already shown you."
• "Thoughtlessness is an attribute grounded on the facts which we call thoughtless actions; and the proposition is equivalent to this,"