Nihil est--In vita priore ego imperator romanus fui - That's nothing--in a previous life I was a Roman Emperor
Nihil obstat - Nothing stands in the way
Nihil sub sole novum - Nothing new under the sun

Nihil tam munitum quod non expugnari pecunia possit

No fort is so strong that it cannot be taken with money. (Cicero)

Nihil - Nothing
Nil actum credens dum quid superesset agendum - Thinking nothing done, while anything was yet to do
Nil actum reputa si quid superest agendum - Don't consider that anything has been done if anything is left to be done. (Lucan)
Nil admirari - To admire nothing. (Horace)
Nil agit exemplum, litem quod lite resolvit - Not much worth is an example that solves one quarrel with another. (Horace)
Nil desperandum! - Never despair! (Horace)