(1)happening without warning or in a short space of time; "a sudden storm"; "a sudden decision"; "a sudden cure"
(2)何の前触れもなく、または短い時間に起こるさま
(1)a sudden storm
(2)突然の嵐
(3)a sudden decision
(4)突然の決定
(5)a sudden cure
(6)応急手当