Conscientious (adjective)

1. Wishing to do what is right, especially to do one's work or duty well and thoroughly.
2. Relating to a person's conscience or moral sense of right and wrong.

Origin:

From latin conscientiosus ('conscientious'), from conscientia ('conscience').

Examples:

1. He was a conscientious worker who always met his deadlines.
2. She was conscientious about recycling and reducing waste.
3. It is important to be conscientious about following safety procedures in the workplace.