| 不 |
bù sù zhī kè | (idiom) uninvited or unexpected guest |
| 不 |
bù | no; not so / (bound form) not; un- |
| 不 |
bù sù | uninvited (guest) / unexpected (appearance) / unwanted presence |
| 速 |
sù | fast / rapid / quick / velocity |
| 之 |
zhī | (possessive particle, literary equivalent of 的) / him / her / it |
| 客 |
kè | customer; visitor; guest / classifier for servings or portions (when ordering food) |