The synonym of the word GULLIBLE is-

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answer is C.

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Gullible refers to someone who is gullible because he believes anything. The term "gullible" was coined in the early nineteenth century.
We know what the word gullible means and thus where it came from. Now consider its application:
A gullible old man, for example, gave money to a phoney beggar. We can see here that an innocent or naive old man gave money to a phoney beggar.
Credible- It refers to someone who is reliable and trustworthy. It differs from assuming to be gullible. As a result, it is the incorrect option.
Believable- Someone or something that is acceptable or credible. It's not the same as aiming for the gullible.
As a result, it is the incorrect option.
Credulous- This term refers to someone who is immature and relies on others. It's similar to wanting to be gullible. So, it is the correct option.
Fallible- It refers to someone or something that is flawed or imperfect. It differs in that it is aimed at the gullible. As a result, it is the incorrect option.

Hence, option 'C' is the correct answer.

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