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Synonyms & Antonyms of informal
1
not rigidly following established form, custom, or rules
- an informal meeting allowed everyone to get acquainted
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2
not designed to be worn only on special occasions
- chose an informal flowery dress
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3
used in or suitable for speech and not formal writing
- the use of informal language in a scholarly article is really inappropriate
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Merriam-Webster unabridgedWords at Play
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Time Traveler for informal
The first known use of informal was in the 15th century
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