1. A description of how a person suffers from a febrile condition: Jack was affected aguishly with alternating periods of chills, fever, and sweating.

A person experiencing an aguishly feverish condition involving alternating hot, cold, and sweating stages could possibly have the symptom of malaria.
2. A reference to how a shaking condition develops: Nelly felt oncoming fits of shivering accompanied by a high temperature, and just she felt aguishly sick.