ambidextrous

Having equal or comparable ability in both hands; in particular, able to write well with both hands.

Some are […]ambidextrous or right-handed on both sides; which happeneth only unto strong and athletical bodies, whose heat and spirits are able to afford an ability unto both.

Equally usable by left-handed and right-handed people (as a tool or instrument).

Practising or siding with both parties.

All False, Shuffling, and Ambidextrous Dealings.

Of a person, bisexual.

Exceptionally skillful; adept in more than one medium, genre, style, etc.

Michelangelo was a very ambidextrous artist, producing sculptures and frescoes with equal ability.

For years, by every possible device, we have been raising the prices of our agricultural products against the foreign buyers […] by every device known to the ambidextrous tradesman and financier. The result is that we have raised up other and unexpected competitors in the markets of the world.