My opinions:
I would let the words poses their real meanings and not give words positive attributes, while they (the words) mean something negative - and vise-versa.
I would define the words below as:
Working Hard: Doing all that you have to do to complete a task.
Efficiency: Doing all that you have to do to complete a task - without wasting extra effort.
Lazy: Not doing a task or doing a task that turned out to be less than ideal.
They tried to bury us, they didn't know we were seeds.