I. ˈdəd noun
Etymology: Middle English dudde
Date: 1567
1. plural
a. : clothing
b. : personal belongings
2.
a. : one that is ineffectual ; also : failure
a box-office dud
b. : misfit
3. : a bomb or missile that fails to explode
II. adjective
Date: 1903
: of little or no worth : valueless
dud checks