Again, Some are Ἀμφαριστεροὶ as Galen hath expreſſed : that is, Ambilevous or left-handed on both ſides; ſuch as with agility and vigour have not the uſe of either : who are not gymnaſtically compoſed : nor actively uſe thoſe parts. Now in theſe there is no right hand : of this conſtitution are many women, and ſome men, who though they accuſtome themſelves unto either hand, do dexterouſly make uſe of neither.
Source: wiktionary