Unbrotherly is an antonym of brotherlike.
As adjectives the difference between unbrotherly and brotherlike
is that unbrotherly is not brotherly; not befitting a brother while brotherlike is resembling a brother or some aspect of one.
brotherlike
English
Adjective
(
en adjective)
Resembling a brother or some aspect of one.
Synonyms
* brotherly
* fraternal
Antonyms
* unbrotherlike
* unbrotherly