1) Fail to appreciate 2) Hold cheap 3) Make too low an estimate of 4) Misjudge 5) Overlook the potential of 6) Review unfairly 7) Sell short 8) To rate or evaluate too low 9) To underestimate 10) Underestimate 1) Misjudge 2) Undervalue 
• (n.) A price less than the value; as, to sell a thing at an underrate. • (v. t.) To rate too low; to rate below the value; to undervalue.
verb make too low an estimate of; `he underestimated the work that went into the renovation`; `Don`t underestimate the danger of such a raft trip on this river`
to rate or evaluate too low; underestimate.