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. [ 1913 Webster ]

2. Clumsy; awkward; unlucky; insincere; sinister; malicious; as, a left-handed compliment. [ 1913 Webster ]

The commendations of this people are not always left-handed and detractive. Landor. [ 1913 Webster ]

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. [ 1913 Webster ]

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. [ 1913 Webster ]