unkindness
US /ʌnˈkaɪnd.nəs/
UK /ʌnˈkaɪnd.nəs/

1.
the quality of being unfriendly, inconsiderate, or harsh
:
•
His constant unkindness made her feel unwelcome.
•
The teacher addressed the issue of unkindness among the students.
the quality of being unfriendly, inconsiderate, or harsh