credulous
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English > Greek (Woodhouse)
adjective
easily believing: εὔπιστος, εὐπαράγωγος, πιθανός
soon persuaded: ταχυπειθής
disposed to trust: πιστευτικός
easy to deceive: P. εὐεξαπάτητος, εὐαπάτητος; see guileless.