Use 'indecorous' to describe behaviors or remarks that violate social or professional etiquette. Wearing a swimsuit to a formal interview is considered indecorous.
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Cultural Variation
What's indecorous can vary between cultures; learn local norms when speaking in different cultural settings. In some cultures, loud laughter in public may be seen as indecorous.
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Emotional Impact
'Indecorous' often implies a negative reaction; those present may feel embarrassed or offended. She found his indecorous remarks on personal matters to be quite upsetting.