imponderable
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/ɪmˈpɑːndərəbl/
🇬🇧
/ɪmˈpɒndərəbl/
something that cannot be easily measured or understood
The value of art is often imponderable, as it varies from person to person.
a factor or aspect that is difficult to estimate or measure
There are too many imponderables in this experiment to draw a firm conclusion.