To do by guessing, intuition, or trial and error; to react to events as they occur; improvise
To play guided by one's musical ear, rather than from a written score.
To prepare; to make ready for action.
Not slow or hesitating; quick in action or perception of any kind.
Prepared for immediate action or use.
Offering itself at once; at hand; opportune; convenient.
Inclined; apt to happen.
Liable at any moment.
ready money; cash