Which term refers to someone who is easily deceived?

The term "gullible" specifically describes someone who is easily deceived or tricked because they tend to believe things without sufficient evidence or skepticism. This characteristic signifies a certain naivety or lack of critical thinking when it comes to evaluating information or the intentions of others. When someone is gullible, they often fall for scams or misinterpret the motives of those around them, highlighting a vulnerability to deception.

The other choices present different meanings that do not align with the concept of being easily deceived. For instance, "wily" refers to someone who is clever, often in a cunning or deceitful way, which is the opposite of being easily deceived. "Strident" describes a loud and forceful tone, typically in speech, indicative of a confrontational attitude rather than vulnerability. "Erratic" pertains to something that is inconsistent or unpredictable, but does not imply susceptibility to deception. Thus, "gullible" stands out as the correct term for someone who is readily misled.