Nothing (is) great unless (it is) good
Petit Seminaire Higher Secondary School's motto is 'Nil Magnum Nisi Bonum'.
Nil Satis Nisi Optimum = Nohing But The Best!
Illawarra Sports High School's motto is 'integer vitae'.
The motto of Strathcona-Tweedsmuir School is 'Nil Nisi Optimum'.
Westerford High School's motto is 'Nil Nisi Optimum'.
Oakhurst Primary School's motto is 'nil nisi optimum'.
according to a bunch of schools that have this as their motto it means: nothing but the best.
Rainbow International School's motto is 'Nil Satis Nisi Optimum'.
I like nil satis nisi optimum meaning "nothing but the best is good enough" but that's because it's the motto of my football team.
Austin College's motto is 'nil nisi per aspera'.
it means, nothing but the best is good enough
Tricky to make an obvious translation because it depends on the context in which you use the word. I'm no expert of Latin, but if you take it from certain choice latin phrases, the word you're looking for is probably 'mortius' or 'mortis' (both meaning dead). Here are some examples: de mortius nil nisi bonum - Of the dead, say nothing but good (Horace) Morituri te salutumus - We who are about to die salute you (Famous gladiator salute) Dulce et Decorum est pro patria mori - It is sweet and proper to die for ones country (Wilfred Owen poem) Causa mortis - Cause of death (legal term)