"Remissful" is not a word in the English language and may be a reference to the word "remiss," which is an adjective that means careless and negligent.  

An example of "remiss" used in context would be if a student was remiss in submitting his assignment on time. That means he was careless and missed the deadline, meaning he did not submit it on time. If he was not remiss about it, he would have turned it in on time and not lost points for his negligent mistake.

Other words that may look or sound similar to the incorrect "remissful" include "remorseful" and "reminisce," which both have completely different meanings and are not at all related to "remiss."

Example sentences

  1. It would be remiss of us not to acknowledge your hard work.
  2. He felt remiss for not attending his friend's important event.
  3. The teacher reminded the students not to be remiss in their studies.
  4. The government's remiss handling of the situation led to public dissatisfaction.
  5. The organization was remiss in maintaining safety standards, leading to several severe accidents.
  6. She was feeling remiss about not spending enough time with her family.
  7. It was remiss of him not to double-check the accuracy of his report.
  8. The detective was criticized for his remiss investigation of the case.
  9. The coach warned the players not to be remiss in their practice routines.
  10. The company's remiss approach to customer service resulted in negative reviews.

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Reference:

Definition of REMISS
negligent in the performance of work or duty : careless; showing neglect or inattention : lax… See the full definition
remiss
1. careless and not doing a duty well enough: 2. careless and not doing a duty…