What is another ex word for very precise?

Here are some synonyms for "very precise" that are not considered expletives:

Formal:

* Exact

* Accurate

* Meticulous

* Rigorous

* Definitive

* Unerring

* Fastidious

* Punctilious

* Specific

* Detailed

Informal:

* Spot-on

* On the nose

* Dead-on

* Sharp

* Right on the money

The best synonym to use will depend on the context of your sentence.