General excess:
* Hyper-: This prefix implies something is excessive, beyond the normal or usual. (e.g., hyperactive, hyperbole)
* Over-: This is a very common prefix indicating something is too much or more than needed. (e.g., overweight, overtired)
* Super-: This prefix implies something is above average or exceptional, but can also suggest excess. (e.g., supersized, super-intelligent)
More specific options:
* Ultra-: This prefix indicates something is extreme or intense. (e.g., ultra-marathon, ultra-violent)
* Excessively-: This is a simple and direct way to convey excess. (e.g., excessively loud, excessively confident)
* Outlandishly-: This suggests something is beyond the bounds of what is normal or expected. (e.g., outlandishly expensive, outlandishly dressed)
The best prefix will depend on the specific word you want to modify and the nuance you want to convey.