AMBIDEXTROUS

adj. using both hands with equal ease

Cross-dominance, also known as mixed-handedness, is a motor skill manifestation where a person favors one hand for some tasks and the other hand for others, while not necessarily being ambidextrous (two-handed), such as someone that writes with a left hand and grabs with the right.It can also refer to mixed laterality, which refers to a person favoring eyes, ears, feet, or hands on opposite sides of the body. Cross-dominance can often be a problem when shooting or in activities that require aim.
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Ambidextrous /am·bi·dex·trous/ able to use either hand with equal dexterity. am·bi·dex·trous adj. Able to use both hands with equal facility. [more]Ambidextrous - Community and Resources

Adjective
1. equally skillful with each hand; "an ambidextrous surgeon"
(synonym) two-handed
(antonym) right-handed
(similar) equipoised
2. marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; "she was a deceitful scheming little thing"- Israel Zangwill; "a double-dealing double agent"; "a double-faced infernal traitor and schemer"- W.M.Thackeray
(synonym) deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-faced, double-tongued
(similar) dishonest, dishonorable

(a.)
Practicing or siding with both parties.
  

(a.)
Having the faculty of using both hands with equal ease.