Usually used when emotions are seen as excessive or overly dramatic in a given situation. The movie scene was intended to be touching, but it felt maudlin and exaggerated.
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Situational Use
Often used in contexts where alcohol or memories invoke nostalgic feelings. He became maudlin every time he heard that old song from his college days.
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Negative Connotation
Carries a slightly disapproving tone, signaling that the sentimentality is excessive. Her maudlin plea for forgiveness annoyed those who heard it.