Definition of unsisterly in US English:

unsisterly

adjective

  • Not showing the support and affection which is thought to be characteristic of a sister.

    ‘it is most unsisterly of me to juxtapose these two photographs’
    • ‘What of Anni's unsisterly remark, during the European championships, that she, Claudia, had deliberately feigned illness?’
    • ‘The hardest thing to understand about Nancy is her unsisterly treatment of Diana.’
    • ‘Her unsisterly sharpness to her youngest sister Amy, for example, causes Amy to burn the volume of tales she had been working on.’
    • ‘I know I sound unsisterly, but remember, poaching is not the same as, er, sharing.’
    • ‘This is unsisterly and unforgivable, and actually counter-productive.’

Pronunciation

unsisterly

/ˌənˈsistərlē//ˌənˈsɪstərli/