General Antonyms:
* Tarnished: This implies a loss of purity or freshness, often due to age or wear.
* Defiled: This suggests a deliberate act of making something impure or unclean.
* Polluted: This refers to contamination, often with harmful substances.
* Damaged: This indicates physical harm or deterioration.
* Dirty: This is a general term for being unclean.
* Soiled: This suggests a stain or mark that makes something less than perfect.
* Used: This implies that something has been used and is no longer new.
More Specific Antonyms:
* Worn: This is a good antonym for "pristine" when referring to objects that have been used over time.
* Scruffy: This is a good antonym for "pristine" when referring to something that is messy or unkempt.
* Degraded: This implies a decline in quality or value.
* Corrupted: This suggests a loss of integrity or purity.
The best antonym for "pristine" will depend on the specific context and the meaning you are trying to convey.