indecorous

Indecorous behavior isn't proper or socially acceptable. It would be indecorous to publish your sister's diary in the newspaper or to tell your extended family an offensive joke at Thanksgiving dinner.

Rude or off-color remarks are indecorous, and wearing a bikini to a formal dinner would also be indecorous. Indecorous things lack decorum, which is good manners or proper behavior. Indecorous, from the Latin decorus, "becoming or seemly," comes from the root word decus, "ornament," and is related to words like "decorate" and "decent."

Definitions of indecorous
  1. adjective
    lacking propriety and good taste in manners and conduct
    indecorous behavior”
    synonyms: indelicate
    indecent
    offensive to good taste especially in sexual matters
    improper
    not suitable or right or appropriate
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    Antonyms:
    decorous
    characterized by propriety and dignity and good taste in manners and conduct
    in good taste
    satisfying generally accepted social or esthetic standards
    sedate, staid
    characterized by dignity and propriety
    proper
    marked by suitability or rightness or appropriateness
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  2. adjective
    not in keeping with accepted standards of what is right or proper in polite society
    indecorous behavior”
    synonyms: indecent, unbecoming, uncomely, unseemly, untoward
    improper
    not suitable or right or appropriate
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