IPA: /rɪˈmɪs.nəs/
KK: /rɪˈmɪs.nəs/
The quality of being careless or negligent in doing something that one should do.
His remissness in completing the project on time caused delays for the entire team.
Remissness → It is formed from "remiss" (from Latin "remissus", meaning relaxed or negligent) and the suffix "-ness" (meaning the state or quality of). The word "remissness" refers to the state of being negligent or careless.
Think of being 'relaxed' or 'negligent' ('remiss') and how that creates a state of carelessness ('-ness').