The difference between Chummy and Mannered
When used as adjectives, chummy means friendly, whereas mannered means having manners or (often excessive) mannerisms.
Chummy is also noun with the meaning: chum.
check bellow for the other definitions of Chummy and Mannered
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Chummy as an adjective (informal):
friendly; on, or trying to be on, intimate terms
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Chummy as a noun:
chum; mate
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Chummy as a noun (obsolete):
A boy who works for a chimney sweep.
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Mannered as an adjective (often, in combination):
Having manners or (often excessive) mannerisms.
Examples:
"His upbringing had led him to act in an overly mannered way."