Etymology
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decorous (adj.)

1660s, "suitable, appropriate;" 1670s, "characterized by or notable for decorum, formally polite and proper," from Latin decorus "becoming, seemly, fitting, proper," from decus (genitive decoris) "an ornament," "to decorate, adorn, embellish, beautify," from PIE root *dek- "to take, accept" (on the notion of "to add grace"). Related: Decorously; decorousness.

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Definitions of decorous

decorous (adj.)
characterized by propriety and dignity and good taste in manners and conduct;
the tete-a-tete was decorous in the extreme
decorous (adj.)
according with custom or propriety;
From wordnet.princeton.edu