adjective
Behaving in a manner that is socially acceptable and proper; characterized by good taste and propriety.
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The decorous attire of the guests at the gala added to the elegance of the event.
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She always makes sure her house is decorous before guests come over.
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I can't believe how decorous his outfit is, he must have spent hours picking it out.
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His decorous behavior in public hides the chaos he feels inside.