juggins
noun/ˈd͡ʒʌɡɪnz/
Etymology Uncertain; perhaps an extended use of Juggins, originally a plebian surname.
1
A fool; someone very credulous or easily fooled.
- […] this boy, though at present a juggins, had the makings of a superb creature.1942, Rebecca West, Black Lamb and Grey Falcon, Canongate, published 2006, page 788: