How would you describe work done with little or no preparation?

The term "extemporaneous" is used to describe work that is done with little or no preparation, suggesting a spontaneous or impromptu approach. In a context where someone delivers a speech or performs a task without prior planning, extemporaneous work implies reliance on one's instincts or existing knowledge rather than a structured or rehearsed plan. This quality can often convey a sense of authenticity or directness, highlighting the ability to think on one's feet.

The other terms do not accurately reflect the concept of working without preparation. "Hackneyed" refers to something that is overused and lacking in originality, rather than associated with the spontaneity of extemporaneous work. "Grievous" signifies something that is severe or serious, typically in a negative context, which does not relate to the nature of preparation. "Fawn" describes an excessive display of affection or flattery, which is not relevant to the idea of preparing or improvising work.