sinisteritas

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

sĭnistĕrĭtas, ātis, f. [sinister, II. A.],

awkwardness , untowardness , perversity (cf. the opp. dexteritas); perh. only in Plin. Ep. 6, 17, 3; 9, 5, 2.