Sisterly

Adjective

 * 1) Pertaining to a sister or sisters.
 * 2) *2011, Jane Martinson, The Guardian, 4 May 2011:
 * Burton designed both Middleton sisters' dresses in white, so that when Pippa picked up Kate's train in the abbey, the two of them were united, visually, in a display of sisterly togetherness.

Adverb

 * 1) In the manner of a sister, behaving as one would expect of a sister; as a sister, as sisters.
 * 2) * 1907, Jack London, The Iron Heel:
 * "What honest man, who is not insane, would take lost women and thieves into his house to dwell with him sisterly and brotherly?"

Adverbs for Sisterly
warmly; sympathetically; comfortingly; tenderly; affectionately; assiduously; persistently; adroitly; patiently; indulgently; hopefully; insistently; consistently; cleverly; impulsively; noticeably; carefully; unfailingly; pleasantly; agreeably.

Thesaurus
agreeable, amiable, amicable, brotherly, congenial, favorable, fraternal, friendlike, friendly, harmonious, kind, neighborlike, neighborly, peaceable, pleasant, simpatico, sociable, sympathique, unhostile, well-affected, well-disposed, well-intentioned, well-meaning, well-meant

Etymology
From.

Adjective

 * Romanian: ca de soră ; de soră

Adverb

 * Croatian:


 * Romanian: ca o soră