un·of·fi·cial/ˏʌnə`fɪʃəl; ˌʌnəˈfɪʃəl◄/ adj 1 not approved or done by someone in authority 非正式批准的; 非官方的: Unofficial reports say about 25 people are dead. 非官方报道说有 25人死亡。 2 not done as part of someone's official duties 非正式的: The Senator is in Berlin on an unofficial visit. 那位参议员正在柏林进行非官式访问。