to have an interest in something or somebody, to be inclined towards doing something

(idiomatic) to cause concern, to be worrisome, to be on one's mind / to be interested, to be curious

to give off the sense that ~ / to feel that ~; to think that ~ / to be in the mood to ~

careless, thoughtless, inattentive

carelessness, thoughtlessness, inattention

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

to pay attention

necessary evil