to fabricate out of thin air; to invent groundlessly; to make up a story without any factual basis
这个故事情节完全是向壁虚构的，没有任何事实依据来支撑。
The plot of this story is entirely fabricated out of thin air, with no factual basis to support it.
Next Idiom
to fabricate out of thin air; to invent groundlessly; to make up a story without any factual basis