Nec Aspera Terrent would probably be closest translated as 'Hardships do not deter us', Nec meaning a negative, not, Aspera meaning hard work, compare 'Per Aspera Ad Astra', and Terrent meaning deter or resist.
Other ways to translate it would be Difficulties Be Damned, as the Kings Regiment translated their motto, or By Difficulty Undaunted as the Royal Inniskilling Fusiliers put the same motto. There are other ways, none of them necessarily any more or less correct than the others.
And they fear not hardship
Also "Hardship does not deter" Royal Air Force Medical Branch badge wording.
Bihar Light Horse's motto is 'Nec Aspera Terrent'.
Queen's Own Hussars's motto is 'Nec Aspera Terrent'.
The motto of West Yorkshire Regiment is 'Nec Aspera Terrent'.
The motto of Drayton Manor High School is 'Nec Aspera Terrent'.
Lancashire Fusiliers's motto is 'Omnia audax'.
King's Regiment's motto is 'Nec Aspera Terrent'.
Essex Regiment's motto is 'Montis insignia calpe'.
Doodia aspera was created in 1810.
Gahnia aspera was created in 1810.
Candoia aspera was created in 1877.
Saxifraga aspera was created in 1753.
Mitromorpha aspera was created in 1864.