adjective
duff
Of poor quality or not working properly.
The radio stays silent because its only battery is duff.
Etymology
Duff belongs to slang associated with something worthless or spurious. Its deeper origin is uncertain, so the modern sense should not be explained through an invented root.
More examples
- We return the duff charger for a refund.
- That duff advice costs us an extra hour.
- The box contains several duff parts we can't use.
Forms
duff