dupeable

accustomed, ordinary, normal, simple, easy, plain, naive, modest, bare, open-and-shut, artless, onefold, natural, smooth, unobtrusive, unaffected, customary, dupeable, free-standing, simplex, homely, humbly, inartificial, unassuming, simple-minded, uncomplicated, unforced, unlabored, unlaboured, unpretending