undervalue

Verb

• lose in value
  • The dollar depreciated again
    

• esteem lightly

• assign too low a value to
  • Don't underestimate the value of this heirloom-you may sell it at a good price
    

Related words

• Synonyms: 
  depreciate , devaluate , devalue , underestimate
• Antonyms: 
  appreciate , apprize , apprise , revalue , overvalue , overestimate