A result of a test that shows as absent something that is present. / (statistics) A type II error (“accepting the null hypothesis when it is false”).

(curling) A shot in which the player curls the stone in the opposite direction in which the stone is expected to curve, due to significant defects in flatness of the ice surface

(medicine, of a bacterium) that is not stained violet by Gram's method

(game theory) of a situation in which there is a net loss

(rhetoric, usually derogatory) A phrase including two negative words (no, not, never, etc.) especially when used as intensifiers in informal English.

(finance) The amount by which the market value of a property falls below the amount of the mortgage secured upon it. / (finance) The situation in which a property is worth less than its mortgage.

(biology) of an RNA strand that is complementary to the positive sense and not transcribed into DNA.

(film) A person whose profession is negative cutting and cuts and matches motion picture negatives using film splicers and film cement.

(finance) A type of loan or loan condition in which the borrower agrees with the lender not to allow any other lender or creditor to rank ahead for payment in the event of a liquidation. Such a loan is unsecured (ie. not backed by a charge over specific assets).

(derogatory, informal) A person who is considered excessively and disagreeably pessimistic.