Answer: precise and not accurate.
Step-by-step explanation:
1) Precise means that the result have low variation, i.e. all the results are close to each other. So, given that the person manages to throw the 3 darts in the same spot, that person is has high precision.
2) Accuracy refers to the ability to be close to the wanted point (in scientific work this is the true value). Therefore, since the darts land out of the bullseye they are not accurate.