vague; indistinct; fuzzy · to blur; to obscure; to confuse; to mix up

I recall less and less of my childhood.

For centuries, astronomers believed that the Milky Way made up the entire universe. Hubble was among the first to show that the fuzzy patches in the sky seen through telescopes were other galaxies, not distant parts of the Milky Way.

The meaning of this sentence is obscure.

Possible side effects include blurred vision and shortness of breath.

This paragraph is vague.