noun
a person who is unattractive or unpleasant in appearance
adjective
describing the customer as unattractive or unpleasant in appearance
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The manager had to deal with an ugly customer who was causing a scene in the store.
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I overheard the cashier complaining about an ugly customer who was being rude.
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That ugly customer was a real pain in the neck for the staff to handle.
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Dealing with difficult customers can feel like facing an ugly customer at every turn.