Is Inconsideration a Noun?

Lack of due consideration; inattention to consequences, thoughtlessness.

What is inconsideration?

in·con·sid·er·ate

adj. 1. Thoughtless of others; displaying a lack of consideration: It is inconsiderate to make noise when people are trying to study. 2. Archaic Not well considered or carefully thought out; ill-advised: an inconsiderate notion.

Is inconsiderate an adjective?

INCONSIDERATE (adjective) definition and synonyms | Macmillan Dictionary.