not alert to danger or deception
"the shrieks of unwary animals taken by surprise"; "some thieves prey especially on unwary travelers"; "seduce the unwary reader into easy acquiescence"- O.J.Campbell
is similar to
easily tricked because of being too trusting
"gullible tourists taken in by the shell game"
is similar to
displaying or feeling no wariness
"an unguarded remark"
is an attribute of
the trait of being cautious and watchful