undervalue

under- +‎ value

undervalue (third-person singular simple present undervalues, present participle undervaluing, simple past and past participle undervalued)

1. (transitive) To underestimate, or assign too low a value to.
2. (transitive) 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.

• underween

undervalue (plural undervalues)

1. An undervaluation; a price or rate below the actual worth.
   • 1938, Law Reporter (volume 158, page 132)

     […] he must therefore prove that the contract was not at such an undervalue as would amount to fraud […]