friendly ：
His friendly manner lulled her into a false sense of security.
他友好的举止使她产生了一种虚假的安全感。
He struck me as a very serious but friendly person
他让我感觉他是一个十分严肃但友好的人。
The hotel offers a friendly atmosphere and personal service.
这家旅馆服务周到，使客人感到宾至如归。
She was on friendly terms with most of the hospital staff.
她和医院大多数工作人员关系融洽。
unfriendly：
Some complain of unfriendly coworkers and feel sad for eight-hour workweeks devoted to tasks they complain.
有些人抱怨不友好的同事,对花8小时做自己抱怨的'工作感到悲伤。
There's no need to be so unfriendly towards them.
没必要对他们这么不客气。
She has a very formal manner, which can seem unfriendly.
她的举止很是郑重其事，有可能会显得不友好。
His tone was curt and unfriendly.
他说话的语调粗暴无礼。