spontaneous

英 [spɒn'teɪnɪəs] 美[spɑn'tenɪəs]

• adj. 自发的；自然的；无意识的

1. happening or arising without apparent external cause;

"spontaneous laughter"

"spontaneous combustion"

"a spontaneous abortion"

2. said or done without having been planned or written in advance;

"he made a few ad-lib remarks"

3. produced without being planted or without human labor;

"wild strawberries"