derogatory

a.
  1. Tending to derogate, or lessen in value; expressing a low opinion; expressing derogation; detracting; injurious; -- with from, to, or unto.
  2. Derogatory clause in a testament (Law),
    a sentence of secret character inserted by the testator alone, of which he reserves the knowledge to himself, with a condition that no will he may make thereafter shall be valid, unless this clause is inserted word for word; -- a precaution to guard against later wills extorted by violence, or obtained by suggestion.