Word for unintentional omitting of context when telling something

Question

It happens when I am deeply focused at something, or I’m completely in my own thoughts, that I tell or ask somebody around me something particular about the subject I am into, but totally forget to give any context regarding this matter. E.g. «Do you know if it has more of an effect at higher altitudes?», where the omitted context could be consuming alcohol.

Is there a word for this, a saying or anything that explains this more specific than my attempt at explaining above.

I want to emphasize that in my question, the omitting of context is unintentional, and an obvious oversight by the questioner on second thought.

Answer 1

pretermission :

1. neglecting to do something; leaving out or passing over something
2. letting pass without notice

inadvertence :

the quality or condition of being inadvertent; heedlessness.

oversight :

an unintentional failure to notice or do something. "he said his failure to pay for the tickets was an oversight"

Absent-minded :

of a person or a person's behavior or manner) having or showing a habitually forgetful or inattentive disposition

Vague :

thinking or communicating in an unfocused or imprecise way. "he had been very vague about his activities"

preoccupied :

of a matter or subject) dominate or engross the mind of (someone) to the exclusion of other thoughts. "his mother was preoccupied with paying the bills