不速而至

to arrive without invitation / unexpected guest / unwanted presence

no; not so / (bound form) not; un-

uninvited (guest) / unexpected (appearance) / unwanted presence

fast / rapid / quick / velocity

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

to arrive / most / to / until