gullible (English) comes from English gull, from Middle English gulle, from Proto-Brythonic gwuɨlann, from Proto-Celtic wailannā, from Proto-Indo-European wai — oh!; woe!.
gullible (English): Easily deceived or duped; naive, easily cheated...
Definitions
Easily deceived or duped; naive, easily cheated...
Ancestry of “gullible”, step by step
gullible traces back through two separate lines of ancestry.