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1.
Non-Trivial is sometimes used by engineers / scientist to (jokingly?) describe the extremely difficult problems that they are faced with.
Some Non-Trivial problems.

The Mechanism Behind High-Temperature Superconductors
Earthquake Predicting
What Is Dark Matter?
Build this suspension bridge out of string and Duct-tape.
by Owza October 08, 2010

Words related to Non-Trivial

difficult trivial