INIMICAL

damaging

harmful

injurious

not friendly

"an inimical critic"

"He hated having to deal with the customers, but what was even worse was his inimical co-workers."

"It was putting up a defense against this inimical group that had occupied most of the corporate offices time."

"She prided her self on being practically immune to the anger and harm these inimical people threw at her."