<prompt> Translate the following text to SwahiliYet he was sure Ser Perth was serious; there was no humor on the face of the prissy thin-mustached man before him.  <response>: Hata hivyo alikuwa na uhakika Ser Perth alikuwa mbaya; hakukuwa na ucheshi juu ya uso wa prissy nyembamba-mustached mtu mbele yake. 