Learn English – a specific term for people who think that they’re always right

There are many words that can be used; that person could be forgetful, or that person could be discourteous. It depends on if you want emphasize the cause or the effect.

discourteous (adj.) showing rudeness and a lack of consideration for other people

absentminded (adj.) (of a person or a person's behavior or manner) having or showing a habitually forgetful or inattentive disposition

My thesaurus lists these promising synonyms for absentminded:

• distracted, preoccupied, inattentive

You might use:

inquisitive
or
motivated