stately

Worthy of respect; dignified, regal.

• Warwick's first glance had revealed the fact that the young woman was strikingly handsome, with a stately beauty seldom encountered.

Deliberate, unhurried; dignified.

• And much as they welcome his promise to repeal "don't ask, don't tell", they are dismayed by the stately pace and bungled tactics of his attempts to do so.
• Germany can’t afford to stick to the stately plod into decline that Merkel initiated any longer. Merz will have to act fast, and break things to pull the country out of the quagmire it finds itself in.

Grand; impressive; imposing.

• In Xanadu did Kubla Khan / A stately pleasure-dome decree: / Where Alph, the sacred river, ran / Through caverns measureless to man / Down to a sunless sea.
• Their stately offices—their pleasant gardens—the magnificent cloisters constructed for their recreation, were all dilapidated and ruinous; […]

In a stately manner.