Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not taking due thought; thoughtless or heedless: proceeded, unthinking, into the trap.
  • adj. Exhibiting a lack of thought: unthinking bravado.
  • adj. Incapable of the power of thought.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Without proper thought; thoughtless.
  • adj. Showing no regard; careless or unconcerned.
  • v. Present participle of unthink.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not thinking; not heedful; thoughtless; inconsiderate.
  • adj. Not indicating thought or reflection; thoughtless.

from The Century Dictionary and Cyclopedia

  • Not thinking; heedless; without thought or care; thoughtless; inconsiderate: as, unthinking youth.
  • Not indicating thought or reflection; thoughtless.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. in a thoughtless manner
  • adj. without care or thought for others
  • adj. not exhibiting or characterized by careful thought
  • adj. mentally sluggish

Etymologies

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