It came back to me then, the fanciful theory that it was this countryside which had absorbed Gillda and hidden her away for ever.

According to my new, and perhaps fanciful, theory, this liquid mass must be gradually lost in the deep bowels of the earth.

We should not be afraid to give fanciful theories a fair hearing.

The mystery surrounding it has excited the popular imagination, making the manuscript a subject of both fanciful theories and novels.

The exact origin is unknown, but there are various fanciful theories.

Other fanciful theories over the years have been:

This is not just some fanciful theory.

It's a fanciful theory without any possible basis in fact.

That group is, as it were, land to let, a mere waste place for fanciful theories.

I heard once the fanciful theory that a cold shower will clear the mind.