Answer:
guarded and wary
Step-by-step explanation:
All this while the Indians came skulking about them, and would sometimes show themselves aloof off, but when any approached near them, they would run away; and once they stole away their tools where they had been at work and were gone to dinner.
These word help support the fact that the Native Americans are being wary of their surroundings "but when any approached near them, they would run away" By running, away, they are guarding themselves from potential harm.
I hope this may help you.