Hasty (adjective)

1. Done or made in a hurry.
2. Acting or done quickly without enough consideration.
3. Performed or executed with undue haste.
4. Characterized by undue haste.
5. Acting or tending to act too quickly or without sufficient thought.

Origin:

Middle english hasti, from old english hæste; akin to old high german heizi hasty.

Examples:

1. The hasty decision proved to be a mistake.
2. He made a hasty retreat.
3. The hasty work was full of errors.
4. The hasty plan was doomed to fail.
5. The hasty departure left many things undone.