What does retard actually mean?
"Retard" is a form of the French word "tard" which means
"late".
"Elle est toujours en retard" translates to "she is always
late". "Retard" is more commonly used when one would mean in
English, "not on time".
"Tard" would be used to describe most other things, such as the
time of day.
"C'est tard, n'est-ce pas?" means, "It's late, isn't it?".