negative

Not positive or neutral; bad; undesirable; unfavourable.

Of a number: less than zero.

Less than zero degrees Celsius or Fahrenheit.

Of a test result: not positive, not detected.

Of electrical charge of an electron and related particles

Denying a proposition; negating a concept.

Pessimistic; not tending to see the bright side of things.

Of or relating to a photographic image in which the colours of the original, and the relations of left and right, are reversed.

Metalloidal, nonmetallic; contrasted with positive or basic.

Often preceded by emotion, energy, feeling, or thought: to be avoided, bad, difficult, disagreeable, painful, potentially damaging, unpleasant, unwanted.