Thorough
Part of speech: adjective
Definition: painstaking and careful not to miss or omit any detail utter; complete; absolute
Example sentence: I know of no scholar more dedicated to bringing a thorough and accurate portrayal of America's involvement in Vietnam than Mark Moyar. Everyone who is interested in a full picture of that oft-misunderstood war should be grateful for his effort.
Careful
Part of speech: adjective
Definition: Full of care or grief; sorrowful, sad.Full of cares or anxiety; worried, troubled.Having care (for); attentive to potential danger, error or harm; cautious.Conscientious and painstaking; meticulous.
Example sentence: You've got to be very careful if you don't know where you are going, because you might not get there.