* Concisely
* Briefly
* Succinctly
* Sharply
* Curtly
Here are some examples:
* "He answered the question tersely, 'No'."
* "The news report was terse, giving only the essential facts."
* "Her terse tone made it clear she was unhappy."
In essence, "tersely" implies a lack of detail and a direct, almost blunt, way of communicating.