01 a. Not decorous; violating good manners; contrary to good breeding or etiquette; unbecoming; improper; out of place; as, indecorous conduct.
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1.
Not decorous; violating good manners; contrary to good breeding or etiquette; unbecoming; improper; out of place; as, indecorous conduct.“It was useless and indecorous to attempt anything more by mere struggle.” — Burke.
Syn.
Unbecoming; unseemly; unbefitting; rude; coarse; impolite; uncivil; ill-bred.