Underestimate
Part of speech: verb
Definition: to make too low an estimate of value, quantity etc., regarding (someone)
Part of speech: noun
Definition: an estimate that is too low
Example sentence: Never underestimate the power of anyone's story... anyone's life.
Undervalue
Part of speech: verb
Definition: to underestimate, or assign too low a value to somethingto have too little regard for someone
Example sentence: I think the Labour government did good and important things, and it's really important not to undervalue them. I see in my constituency how it helped with education and all those things.