
Duffer
Informal Insult
Used casually in conversation to tease someone about their poor skills.

You missed the goal again? You're quite the duffer, aren't you?
Avoid Offense
Be careful using 'duffer' as it might offend someone who is sensitive about their abilities.

I hope you don't mind the joke; I didn't mean to call you a duffer seriously.
Humorous Undertone
Often has a playful or humorous tone rather than being harshly critical.

My grandpa calls himself a duffer when he misses a putt.
Compare with
BunglingClumsyDoltishHopelessIdioticIneptSillyStupid
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