unsportsmanlike

unsportsmanlike /ˌʌnˈspoɚtsmənˌlaɪk/ adjective
unsportsmanlike
/ˌʌnˈspoɚtsmənˌlaɪk/
adjective
Britannica Dictionary definition of UNSPORTSMANLIKE
: not fair, respectful, and polite toward other players when participating in a sport : not sportsmanlike