ugly duckling

something that stands out, out of place

The Ugly Duckling is a fairy tale written in 1872 by Danish author Hans Christian Andersen. Its moral teaching is that inner virtues will eventually overshadow physical appearance.
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Noun
1. an ugly or unpromising child who grows into a beautiful or worthy person
(hypernym) anomaly, unusual person

ugly or plain child (who grows up to be pretty) She was really an ugly duckling when she was a child but now she is quite beautiful.

BRUTTO ANATROCCOLO