Antonyms of adj decorous

2 senses of decorous

Sense 1
decorous (vs. indecorous) -- (characterized by propriety and dignity and good taste in manners and conduct; "the tete-a-tete was decorous in the extreme")

indecorous (vs. decorous), indelicate -- (lacking propriety and good taste in manners and conduct; "indecorous behavior")

Sense 2
becoming, comely, comme il faut, decent, decorous, seemly -- (according with custom or propriety; "her becoming modesty"; "comely behavior"; "it is not comme il faut for a gentleman to be constantly asking for money"; "a decent burial"; "seemly behavior")

INDIRECT (VIA proper) -> improper -- (not suitable or right or appropriate; "slightly improper to dine alone with a married man"; "improper medication"; "improper attire for the golf course")

Similarity of adj decorous

2 senses of decorous

Sense 1
decorous (vs. indecorous) -- (characterized by propriety and dignity and good taste in manners and conduct; "the tete-a-tete was decorous in the extreme")
       => in good taste (predicate) -- (satisfying generally accepted social or esthetic standards)
       => sedate, staid -- (characterized by dignity and propriety)
          Also See-> proper#1

Sense 2
becoming, comely, comme il faut, decent, decorous, seemly -- (according with custom or propriety; "her becoming modesty"; "comely behavior"; "it is not comme il faut for a gentleman to be constantly asking for money"; "a decent burial"; "seemly behavior")
       => proper (vs. improper) -- (marked by suitability or rightness or appropriateness; "proper medical treatment"; "proper manners")