General opposites:
* Common: This is the most general and straightforward opposite of rare.
* Abundant: This implies a large quantity or amount of something.
* Frequent: This refers to something that happens often.
* Ordinary: This means something that is typical and not unusual.
Specific opposites depending on context:
* Well-done (for meat): This is the opposite of rare when referring to the level of cooking for meat.
* Frequent (for events): This is the opposite of rare when referring to how often something occurs.
* Plentiful (for resources): This is the opposite of rare when referring to the availability of something.
To provide the most accurate opposite, please provide more context about how "rare" is being used in your sentence.