突如たる

(1)exceedingly sudden and unexpected; "came to an abrupt stop"; "an abrupt change in the weather"

(2)非常に突然で予想外の

(3)happening without warning or in a short space of time; "a sudden storm"; "a sudden decision"; "a sudden cure"

(4)何の前触れもなく、または短い時間に起こるさま

(1)