unsuspicious (adj.)

• artless
• bluff
• blunt
• candid
• childlike
• confiding
• credulous
• dependent
• direct
• doting
• fond
• frank
• guileless
• infatuated
• ingenuous
• innocent
• naive
• open
• openhearted
• outspoken
• overcredulous
• plain
• reliant
• simple
• sincere
• single-minded
• superstitious
• trustful
• trusting
• trusty
• uncritical
• unguarded
• unreserved
• unsophisticated
• unsuspecting
• unwary