1) Confiding 2) Credulous 3) Free of suspicion 4) Full of trust 5) Not at all suspicious 6) Not suspicious 7) Trusting 8) Unsuspecting 9) Unsuspicious Found on https://www.crosswordclues.com/clue/trustful
adjective inclined to believe or confide readily; full of trust; `great brown eye, true and trustful`- Nordhoff & Hall Found on https://www.encyclo.co.uk/local/20974