- wary - marked by keen caution and watchful prudence; "they were wary in their movements"; "a wary glance at the black clouds"; "taught to be wary of strangers"
Antonyms: unwary, gullible, incautious, unguarded
- leery, mistrustful, suspicious, untrusting, wary - openly distrustful and unwilling to confide
Antonyms: trustful, trusting (indirect, via distrustful)