In′de‐co″rous (?; 277), a. [L. indecorous. See In- not, and Decorous.] 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.