What is a word that means easily understood?

There are many words that mean "easily understood," depending on the specific nuance you want to convey. Here are some options:

General:

* Clear

* Simple

* Straightforward

* Understandable

* Comprehensible

* Accessible

Informal:

* Easy

* Plain

* Crystal clear

* No brainer

Formal:

* Lucid

* Articulate

* Explicit

* Cogent

More specific:

* Self-explanatory (easily understood without needing an explanation)

* Intuitive (easily understood through natural instinct)

* Concise (brief and to the point)

* Unambiguous (having only one possible meaning)

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