féi1 xing4 med6 yiu2 Sinological IPA (key): /fei̯⁵⁵ sɪŋ²¹ mɐt̚² jiːu̯³⁵/ <span class="searchmatch">非</span><span class="searchmatch">誠</span><span class="searchmatch">勿</span><span class="searchmatch">擾</span> (on advertisements) If you are not sincere then do not bother. / Serious...
See also: <span class="searchmatch">非</span><span class="searchmatch">誠</span><span class="searchmatch">勿</span><span class="searchmatch">擾</span>...