adjective

1. Not considerate of others.

   “Not replacing the roll after using the last of the toilet paper is very inconsiderate.”

2. Not giving enough consideration to one's actions, conclusions, etc.; acting too quickly without considering the risks and consequences.

3. Resulting from insufficient consideration.

Synonyms: hasty, inattentive, rash, unreflecting, inconsiderable, negligible, trifling, thoughtless