impulsive , lash out

U.K. Bank Group Lashes Out at 'Irresponsible' Reforms

The U.K.'s leading banking association ended 2009 with a bang, accusing authorities of impulsive reforms that could undermine the U.K. as a top financial center and crimp future economic growth.

lash out

Make a sudden blow or fierce verbal attack. For example, The mule lashed out with its hind legs, or After listening to Dad's criticism of his driving, Arthur lashed out at him. [Second half of 1500s]

im·pul·sive (ĭm-pŭl'sĭv)
adj.

1. Inclined to act on impulse rather than thought.
2. Motivated by or resulting from impulse: such impulsive acts as hugging strangers; impulsive generosity. See synonyms at spontaneous.
3. Having force or power to impel or incite; forceful.
4. Physics. Acting within brief time intervals. Used especially of a force.

impulsively im·pul'sive·ly adv.
impulsiveness im·pul'sive·ness or im'pul·siv'i·ty n.