duffer

Worthless; not working properly, defective.

“Why do I always get a shopping trolley with duff wheels?”

An incompetent or clumsy person.

A player having little skill, especially a golfer who duffs.

A pedlar or hawker, especially one selling cheap or substandard goods.

Cheap or substandard goods sold by a duffer.

A cow that does not produce milk.

A cattle thief or thief of other livestock; one who alters the brands of cattle.

A racing pigeon that does not perform well.

Any of various nymphalid butterflies of the genus Discophora.