manso
/ˈmansəʊ/Chiefly Bullfighting
noun
A meek, tame, or cowardly person or animal, especially a tame or timid bull.
adjective
Of a bull: tame, timid, lacking in aggression.
Origin
Early 20th century; earliest use found in Arthur Conan Doyle (1859–1930), writer. From Spanish manso tame, unaggressive, domesticated, probably from post-classical Latin mansus tame (700 in a Spanish source), probably back-formation from classical Latin mansuētūdō.