This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, characteristic of, or befitting sisters or a sister.

ad. As a sister.

adj. Pertaining to a sister or sisters.

ad. In the manner of a sister, behaving as one would expect of a sister; as a sister, as sisters.

adj. Like a sister; becoming a sister, affectionate

Pertaining to, characteristic of, or befitting a sister.

adj. like or characteristic of or befitting a sister

"But there was nothing "sisterly" about the message, which urged Sor Juana to giveup writing and devote herself entirely to religion."

brotherly    fatherly    cousinly    filial    wifely    unfeigned    conjugal    womanly    tenderest    paternal