For loudness:
* Loudly: This is the most common and straightforward option.
* Shrill: This implies a high-pitched shout.
* Boisterously: This suggests a loud and enthusiastic shout.
For other nuances:
* Angrily: This implies shouting out of anger.
* Painfully: This suggests shouting in pain or distress.
* Triumphantly: This suggests shouting in celebration or victory.
* Joyfully: This suggests shouting out of happiness.
* Desperately: This suggests shouting out of urgency or fear.
* Hysterically: This suggests shouting out of extreme emotion.
For a specific way of shouting:
* Suddenly: This emphasizes the abruptness of the shout.
* Repeatedly: This emphasizes that the shout is happening multiple times.
* In unison: This emphasizes that multiple people are shouting together.
Ultimately, the best adverb to use will depend on the context of your sentence.