precipitate

When the full stores their ancient bounds disdain, / Precipitate the furious torrent flows.

Though thoughtful far beyond your years, you are very inexperienced; and I would not have a preference that may originate in your little knowledge of others, or a romantic exaggeration of slight kindnesses, lead you into a precipitate union with me, unless you most seriously examine your own heart, and weigh the various consequences.

The king was too precipitate in declaring war.

It had cost me a distinct psychological effort to do so, and now that I was shut inside I had a momentary longing for precipitate retreat.