不期而至

to arrive unexpectably / unexpected

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

unexpectedly / to one's surprise

variant of 期[qi1] / period / cycle

a period of time / phase / stage / classifier for issues of a periodical, courses of study / time / term / period / to hope / Taiwan pr. [qi2]

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

to arrive / most / to / until