天馬行空

Idiom

 * 1)  powerful and unrestrained in style; bold and imaginative; abounding with novel ideas
 * 2)  progressing swiftly; unrestricted and developing rapidly
 * 3)  speaking in a roundabout, irrelevant or exaggerated way; empty and impracticable talk
 * 1)  speaking in a roundabout, irrelevant or exaggerated way; empty and impracticable talk