Merriam-Webster Collegiate Dictionary - indecorous

 adjective  Etymology: Latin indecorus, from in- + decorus decorous  Date: 1668 not decorous ; conflicting with accepted standards of good conduct or good taste  • ~ly adverb  • ~ness noun Synonyms:  ~, improper, unseemly, unbecoming, indelicate mean not conforming to what is accepted as right, fitting, or in good taste. ~ suggests a violation of accepted standards of good manners ~ behavior. improper applies to a broader range of transgressions of rules not only of social behavior but of ethical practice or logical procedure or prescribed method improper use of campaign contributions. unseemly adds a suggestion of special inappropriateness to a situation or an offensiveness to good taste remarried with unseemly haste. unbecoming suggests behavior or language that does not suit one's character or status conduct unbecoming to an officer. indelicate implies a lack of modesty or of tact or of refined perception of feeling indelicate expressions for bodily functions.