Brotherly
Webster's Dictionary [1]
(1): (adv.) Like a brother; affectionately; kindly.
(2): (a.) Of or pertaining to brothers; such as is natural for brothers; becoming to brothers; kind; affectionate; as, brotherly love.
King James Dictionary [2]
BROTH'ERLY, a. Pertaining to brothers such as is natural for brothers becoming brothers kind affectionate as brotherly love.
Shakespeare uses this word as an adverb. "I speak but brotherly." But the use is not authorized.
International Standard Bible Encyclopedia [3]
bruth´ẽr - li ( אח , 'āḥ , "brother"; φιλαδελφία , philadelphı́a , "brotherly love"): Like a brother in all the large human relationships indicated above; e.g. the early friendly and fraternal alliance between Tyre and Israel as illustrated by "brotherly covenant" between David and Solomon, and Hiram, king of Tyre ( 2 Samuel 5:11; 1 Kings 5:12 ), and repudiated in a later generation by the treachery of Tyre ( Amos 1:9 ). See Brotherly Kindness (LOVE).
