Select the most appropriate ANTONYM of the given word. Gullible

Gullible" describes someone who is easily deceived or manipulated because they are too trusting or naive. Such individuals may believe things without questioning their truthfulness or validity, making them vulnerable to being taken advantage of by others Credulous: Credulous means having or showing too great a readiness to believe things. It is a synonym of gullible, meaning easily fooled or deceived. Pliant: Pliant means flexible or easily influenced or manipulated. While it doesn't directly relate to the concept of being easily fooled, it does imply a certain level of adaptability or susceptibility to external influence. Cynical: Cynical means distrustful of human sincerity or integrity. It is the opposite of gullible, indicating a tendency to doubt or disbelieve in the honesty or motives of others. Simple: Simple means uncomplicated or easy to understand. While it doesn't directly relate to the concept of being easily fooled, it implies a lack of complexity or sophistication that could make one less susceptible to deception. However, it is not a direct antonym of gullible.