What are the prefix and suffix of word invariably?

The word "invariably" doesn't have a prefix and a suffix in the traditional sense.

Here's why:

* "In-" is often a prefix, meaning "not" or "opposite of". However, in "invariably", it's part of the root word "vary".

* "-ly" is a common suffix, indicating an adverb.

So, the word "invariably" is formed from the root word "vary" with the addition of the "-ly" suffix.