Non Impune Feres
Contemnit mortem, qui non moriturus inultus;
Una etiam est hostis certa ruina sui.

Here is the vocabulary:
non - not, no
impune - with impunity, without punishment
fero - bear, carry
contemno - look down on, disdain
mors - death
qui - who, which, that
morior - die
inultus - unavenged
unus - one
etiam - even
sum - be, exist
hostis - enemy
certus - certain
ruina - downfall, destruction
suus - reflexive possessive pronoun