a. [ L. indecorous. See In- not, and Decorous. ] Not decorous; violating good manners; contrary to good breeding or etiquette; unbecoming; improper; out of place;
It was useless and indecorous to attempt anything more by mere struggle. Burke.
adv. In an indecorous manner. [ 1913 Webster ]
n. The quality of being indecorous; lack of decorum. [ 1913 Webster ]