* Erratic: Not regular or consistent; unpredictable.
* Errant: Wandering; straying from the right course.
* Error: A mistake; a departure from accuracy.
* Erroneous: Wrong; incorrect.
It's worth noting that the root word "err" is often used to describe actions or thoughts that are off-track or incorrect. While it can be associated with wandering, it's not the primary meaning.