Wary
/ˈwɛəɹ.i/
adjective
Cautious of danger; carefully watching and guarding against deception, trickery, and dangers; suspiciously prudent
“He is wary of dogs.”
Characterized by caution; guarded; careful; on one's guard
Thrifty, provident
Synonyms: careful, cautious, chary, guarded, careful, circumspect, scrupulous