having the left hand more dominant or effective than the right; preferably using the left hand

a left-handed pitcher.

adapted to or performed by the left hand

a left-handed tool; a left-handed tennis serve.

situated on the side of the left hand.

Machinery .

rotating counterclockwise.

noting a helical or spiral member, as a gear tooth or screw thread, that twists counterclockwise as it recedes from an observer.

Building Trades . left-hand ( def. 3 ) .

ambiguous or doubtful and often unfavorable or derogatory by implication

a left-handed compliment.

clumsy or awkward.

of, pertaining to, or issuing from a morganatic marriage

so called from the custom, in morganatic marriage ceremonies, of having the bridegroom give his left hand to the bride.

with the left hand

He writes left-handed.

toward the left hand; in a counterclockwise direction

The strands of the rope are laid left-handed.

adjective

ambidextrous , disingenuous , mala fide , ambilevous , awkward , clumsy , dubious , gauche , insincere , maladroit , sinister , sinistral , southpaw