What does arduum mean in Latin?

arduum, a noun, means “steep place, steep; difficulty”.

What is the genitive of arduum?

The genitive singular is arduī. arduum is neuter, second declension.

noun · neutersecond declension

arduum n (genitive arduī)

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

arduum ī, n

arduus, a steep place, steep: ardua evadere, L.: in ardua montis ite, O.: per arduum scandere, H.—Fig., difficulty: nil mortalibus ardui est, H.