The project's success was an unknown quantity at this point.
unknown origin
Frequency:
60
%
The artifact's unknown origin puzzled the archaeologists.
unknown territory
Frequency:
50
%
The explorers ventured into unknown territory.
unknown destination
Frequency:
45
%
The map led them to an unknown destination.
Idiomatic Expressions for unknown unknown
Phrase: Navigating the unknown unknowns
Meaning: Dealing with unexpected challenges or situations
Usage: As a leader, you must be prepared for navigating the unknown unknowns in a constantly changing business environment.