DictionaryindecorousSocially improper
adjective

indecorous

in-DEK-er-us/ɪnˈdekərəs/

Not meeting accepted standards of proper behavior.

The guest's loud laughter and sprawling posture are indecorous during the solemn ceremony.

A guest loudly laughs and sprawls across a chair during a solemn formal ceremony as others look disapprovingly, inappropriate behavior.
Etymology

Latin decorus described what was fitting or becoming; its negative marked what was unbecoming or unseemly. Applied to conduct, this judges whether behavior suits the situation and meets expectations of propriety or good taste.

In context

Rocky Ruggiero51:43
what is indecorous about this painting well how about the first monumental representation of the Virgin Mary's cleavage in the history of art
"Renaissance Pleasure Palaces: The Art of Delectation"

More examples

  • Shouting across the courtroom is indecorous.
  • She apologizes for her indecorous remarks about his salary.
  • The board chair refuses to tolerate indecorous behavior at meetings.

Forms

indecorous

indecorously adverb — In a way that violates social standards.

Similar words

improper
Broader term covering violations of rules as well as social standards.
unseemly
Emphasizes behavior that looks inappropriate for someone's role or situation.