Devalue vs Undervalue - What's the difference?

As verbs the difference between devalue and undervalue

is that devalue is to lower or remove the value of something while undervalue is to underestimate, or assign too low a value to.

(devalu)

To lower or remove the value of something.

To lose value; to depreciate.

* devaluate

To underestimate, or assign too low a value to.

To have too little regard for.

* Atterbury

In comparison of it I undervalued all ensigns of authority.

* Dryden

I write not this with the least intention to undervalue the other parts of poetry.

* (l)