不良 [词典] bad; undesirable; unhealthy; harmful; badness; [例句]也会对大脑产生不良影响,如焦虑和神经质的行为。There are also unpleasant brain effects such as anxiety and neurotic behaviour.
不受欢迎的人 [词典] [法] undesirable; [例句]政府已经宣布法国大使为不受欢迎的人,勒令其离境。The government has declared the French ambassador persona non grata and ordered him to leave the country.