characterized by dignified propriety in conduct, manners, appearance, character, etc.

[1655–65; < L decōrus seemly, becoming, deriv. of decus; see DECORATE, -OUS]

—deco·rous·ly, adv.

—deco·rous·ness, n.

—Syn. proper, becoming.

—Ant. undignified. (Random House Webster's Unabridged)