Having great speed or force; swift, driving, violent; (of a person) eager, impetuous. Occasionally with of. Obsolete except as retained in rank rider…

Impetuous, precipitate; wilful, headstrong, unruly; capricious. In early use also: excessively or… Of a personal attribute, action, etc. Now rare.

Of physical things or actions: Having much impetus; moving with great force or violence, or characterized by violent motion; very rapid, forcibly…

Impetuous, violent.

Of movement (esp. of a horse or rider): headlong, impetuous.