not kind or pleasant to somebody an unfriendly atmosphere unfriendly (to/towards somebody) There's no need to be so unfriendly towards them. the use of environmentally unfriendly products (= that harm the environment) opposite friendly See related entries: Describing unpleasant traitsExtra examples She was really unfriendly to me. a distinctly unfriendly tone of voice the use of environmentally unfriendly products ‘Yes?’ he said in an incredibly unfriendly voice. She shot him an unfriendly glance. The atmosphere in the room was distinctly unfriendly. The report said that the Church can appear unfriendly to outsiders.