remiss
Remiss (adj) means Careless or negligent about a duty or responsibility. Example: “It would be remiss of me not to mention the risks involved.”
How to use remiss
Learner’s notesIn plain EnglishFailing to do something you were supposed to do — careless about your duty.
A formal word, often used in the set phrase "it would be remiss of me..." before mentioning something important.
Fill the gap
Can you complete this real example?
It would be _____ of me not to mention the risks involved.
Etymology
From Latin remissus ("slack, negligent"), the past participle of remittere ("to relax, let go").