This is the 5805th most frequent Arabic word.
مستحيل
Impossible.
Here, 'مستحيل' ('impossible') is used as an adjective describing a situation or task that cannot logically occur.
هذا الأمر مستحيل.
This matter is impossible.
In this instance, 'مستحيل' is used as an interjectory exclamation to express incredulity towards an improbable scenario.
أن تُصبح الشمس زرقاء؟ مستحيل!
For the sun to become blue? Impossible!
Here, 'مستحيل' is employed to directly and succinctly convey disbelief in a statement or claim.