S / sĭnistĕrĭtas
noun

sĭnistĕrĭtas

gen. ātis · gender feminine · decl. 3rd
sinister, II. A.
awkwardness; untowardness; perversity
awkwardness, untowardness, perversity (cf. the opp. dexteritas); perh. only in Plin. Ep. 6, 17, 3; 9, 5, 2.