hasty

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Done or made with haste, especially.
• adjective Done or made without due consideration or attention; precipitate or cursory: synonym: impetuous.
• adjective Done or made rapidly due to pressing circumstances.
• adjective Acting with too much speed or haste; hurried.
• adjective Impatient or rudely abrupt.

from The Century Dictionary.

• Moving or acting with haste; quick; speedy: opposed to slow.
• Eager; precipitate; rash; inconsiderate; acting or arising from heedless impulse or passion: opposed to deliberate.
• Requiring haste or immediate action.
• Early ripe; forward; hasting.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Involving haste; done, made, etc., in haste.
• adjective rare Demanding haste or immediate action.
• adjective Moving or acting with haste or in a hurry; hurrying; hence, acting without deliberation; precipitate; rash; easily excited; eager.
• adjective Made or reached without deliberation or due caution
• adjective Proceeding from, or indicating, a quick temper.
• adjective obsolete Forward; early; first ripe.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Acting in haste; being too hurried or quick. (e.g. Without much thinking about it they made a hasty decision to buy it.)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective done with very great haste and without due deliberation
• adjective excessively quick