Explanation:

• Helpless means unable to protect oneself or act effectively.

• The sentence "He quarreled with his boss helpless of the consequences" means he quarreled without being able to avoid or control the consequences.

• Although it’s a bit unusual phrasing (more common would be "regardless of the consequences" or "unaware of the consequences"), helpless fits better than headless (which means without a head) or both.

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  “Headless” literally means “without a head,” and is mostly used literally or metaphorically to describe something done without leadership or direction (like a “headless chicken”).

  In the sentence:

  He quarreled with his boss ___ of the consequences.

  • Using “headless” here is not standard or correct English because it doesn’t make sense to say someone acted “headless of the consequences.”

  • “Helpless” means lacking power or ability to do something, so if the sentence is trying to express that he was powerless about the consequences, “helpless” fits better.

  • However, the sentence sounds a bit awkward in both cases; a more natural phrase would be “regardless of the consequences” or “without regard to the consequences.”

  Summary:

  • “Headless” is not correct here.

  • “Helpless” is the better option.