Definition of brownest:
(n) :
(countable and uncountable) A colour like that of chocolate or coffee.
(adj) :
Having a brown colour.
(n) :
(sometimes capitalised, countable, informal, ethnic slur) A person of mostly Latin American (or Latino), Middle Eastern/North African, South Asian, and sometimes Southeast Asian, Pacific Islander, or rarely Native American descent; a brown-skinned person; someone of mulatto, or biracial appearance.
(n) :
(snooker, countable) One of the colour balls used in snooker, with a value of 4 points.
(n) :
(informal) A brown trout (Salmo trutta).
(v) :
(intransitive) To become brown.