"Imperceptive" Natural Recordings by Native Speakers
The word "imperceptive" means having or showing a lack of awareness or sensitivity, often in regards to one's surroundings or the emotions or needs of others.
Imperativeness refers to the quality or state of being imperative, which is the quality of being strongly urgent or necessary. It can also refer to the quality of being peremptory, meaning authoritative or commanding in a way that allows no argument or debate. In general, imperativeness suggests a sense of importance, gravity, or urgency that demands attention and action.