What is characterized by a sharp insight and quick judgment?

The term that is characterized by sharp insight and quick judgment is acumen. This word specifically refers to the ability to make good decisions and have keen discernment in a particular area, whether it be in business, finance, or other fields requiring a depth of understanding and rapid assessment of situations.

The essence of acumen lies in its connotation of not only intelligence but also an astuteness in practical matters. Someone with acumen can quickly assess a scenario and understand the nuances that guide effective decision-making. This insight allows for a refined and often intuitive grasp of complex environments or information.

The other terms do not convey the same meaning of insight and judgment. Alacrity refers to a cheerful readiness or eagerness to respond promptly, which does not encompass the judgment aspect. Aegis implies protection or support, lacking the qualities of insight and judgment. Abeyance indicates a state of being inactive or suspended, which is not related to the capability of making sharp judgments. Hence, acumen stands out as the most fitting term to describe sharp insight and quick judgment.