brotherly
adj.adj. describing a relationship or behavior that is like that of a brother — friendly, loyal, and supportive.
adj. relating to or characteristic of a brother; exhibiting the qualities of a brother, such as loyalty, affection, and solidarity.
The two friends shared a brotherly bond.
The older brother showed his younger sibling a brotherly kindness by helping him with his homework.
The novel explores the complex brotherly rivalry that defined the lives of the two protagonists, ultimately leading to a tragic yet cathartic resolution.
From Middle English brotherly, from Old English brōþorlīċ, from Proto-Germanic *brōþurlīkaz, equivalent to brother + -ly (adjectival suffix). Cognate with Dutch broederlijk (“brotherly”), German brüderlich (“brotherly”), Swedish broderlig (“brotherly”). Piecewise doublet of friarly.
From Middle English brotherly, equivalent to brother + -ly (adverbial suffix).