spontaneous

英 /spɒnˈteɪniəs/ 　美 /spɑːnˈteɪniəs/

adj. 自发的；未经安排的Happening naturally without being planned or deliberately caused
adj. 随性的；自然率真的Acting freely on feelings rather than following plans

We made a spontaneous trip to the beach yesterday.

昨天我们临时起意，去了一趟海边。

Spontaneous conversations between colleagues can generate creative ideas that formal meetings sometimes fail to produce.

同事间自发的交谈可以激发创意，而正式会议有时反倒做不到。

搭配

spontaneous reaction 自发反应spontaneous applause 自发的掌声spontaneous decision 即兴决定

强调非预先安排，不等于“无意识的”。

spontaneously (adv.)、spontaneity (n.)

近义 unplanned、impromptu

反义 planned、rehearsed