spontaneous

词形变化：

副词: spontaneously | 名词: spontaneousness |

同义词：

instinctive | natural | automatic | inherent | extemporaneous | involuntary | voluntary | option | impulsive | unprompted | spur-of-the-moment | artless | unstructured | unplanned | free | unrehearsed | unconstrained | ad-lib | self-generated | unwritten |

反义词：

induced | compulsory |

词义辨析：

同义:

a.自发的

instinctive

inherent

natural

automatic

同义参见:

extemporaneous

option

voluntary

involuntary

反义:

a.自发的; 非强制的

compulsory

反义参见:

studied