What is an Oxymoron?

Oxymoron is "a phrase in which two words with contradictory meaning" are brought together. For example,

1) Clearly misunderstood

2) Exact estimate

3) Small crowd

4) Act naturally

5) Found missing

6) Fully empty

7) Pretty ugly

8) Seriously funny

9) Only choice

10) Original copy

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11) Happily married

Sent by Desmond