He pointed to a filthy jug of unknown origin and equally unknown contents.

Some drums ruptured, spilling their unknown (at the time) contents.

The information it conveys is of unknown content and purpose.

They faced a black hole of unknown content and unrelieved darkness.

She possesses an unusual box without handle, lid, or hinges meant to safeguard its unknown contents.

The dedicatory cache consisted of a house-shaped clay box with unknown contents.

Another eight octos were pouring the unknown contents of huge containers into the pool.

Bithras sent an emergency message to Mars, contents unknown to us, and returned to his bed, exhausted, soon after.

Avoid swimming in waters of unknown bacterial content.

The national employment plans are often still seen as secret government documents, their contents unknown to national Members of Parliament and the public.