[adv] (archaic as adverb) in a brotherly manner [adj] like or characteristic of or befitting a brother; "brotherly feelings"; "close fraternal ties"
brotherlike, fraternal
sisterlike, sisterly, sororal
affectionate, agreeable, amiable, amicable, benign, benignant, Christian, Christlike, Christly, compassionate, congenial, cordial, decent, devoted, favorable, fraternal, friendlike, friendly, good, gracious, harmonious, human, humane, kind, kindhearted, k