'Sisterly' definitions:

Definition of 'sisterly'

From: WordNet
adjective
Like or characteristic of or befitting a sister; "sisterly kindness"; "sororal concern" [syn: sisterly, sisterlike, sororal] [ant: brotherlike, brotherly, fraternal]

Definition of 'Sisterly'

From: GCIDE
  • Sisterly \Sis"ter*ly\, a. Like a sister; becoming a sister, affectionate; as, sisterly kindness; sisterly remorse. --Shak. [1913 Webster]