dē-dĕcōrus, a, um,
adj., disgraceful, dishonorable, shameful (very rare), Plaut. Bacch. 5, 2, 73: majoribus suis, Tac. A. 3, 32; id. ib. 12, 47.
dē-decōrus adj., dishonoring, disgraceful: maioribus suis, Ta. ...
An Elementary Latin Dictionary