Left-handed

a.
  1. Having the left hand or arm stronger and more dexterous than the right; using the left hand and arm with more dexterity than the right.
  2. Clumsy; awkward; unlucky; insincere; sinister; malicious; as, a left-handed compliment.
  3. Having a direction contrary to that of the hands of a watch when seen in front; -- said of a twist, a rotary motion, etc., looked at from a given direction.
    4. Left-handed marriage ,
    a morganatic marriage. See Morganatic.
    Left-handed screw ,
    a screw constructed to advance away from the observer, when turned, as in a nut, with a left-handed rotation. An ordinary wood screw is right-handed.