Does impeccable have a root word?

Yes, the root word of "impeccable" is peccare, which is Latin for "to sin" or "to err".

Here's how it breaks down:

* In- is a prefix meaning "not" or "without".

* Peccare is the root word, meaning "to sin" or "to err".

* -able is a suffix meaning "capable of" or "worthy of".

Therefore, "impeccable" literally means "not capable of sinning" or "without fault".