The undecorative hallway made the museum's exhibits seem even more striking.

The gallery's undecorated walls allowed the artwork to be the sole focus of attention.

After the party, we had to undecorate the hall before midnight.

After the celebration, my roommate undecorates the apartment while I wash the dishes.

After the party, we started undecorating the hall to make room for the next event.

Her undecorousness at the diplomatic reception became the subject of whispered gossip.

His undecorous laughter at the memorial service made several guests uncomfortable.

He undecorously interrupted the ceremony, laughing loudly and waving his arms.

The antique vase was undecorable, its surface too fragile for any painting or embellishment.