* Con-: This is the most common prefix for "consistent" and implies a state of being together or united. For example, "consistent" itself uses this prefix.
* Co-: This prefix is also used to indicate togetherness or jointly. You might see this in words like "co-occurring" or "co-dependent."
* In-: This prefix, meaning "not" or "the opposite of," is less commonly used for "consistent," but it could be used to denote a lack of consistency, like in "inconsistent."
Ultimately, the best prefix to use depends on the specific meaning you want to convey.