instantaneous [ˌɪnstənˈteɪniəs]

以下由轻松背单词网站提供

adj.立即的，瞬间发生的

happening immediately , without any delay

He had an instantaneous response. 他立刻作了反应。
She accidentally swallowed the poison and death was instantaneous. 她意外地吞下了毒药，当即就死去了。