sedate

Remaining composed and dignified, and avoiding too much activity or excitement.

[…] they will rashly huddle up all together, and not admitting the least check of a sedate judgement, publish onely the impetuous dictates of their indiscreet and too precipitant fancie […]

But who like thee can boast a Soul sedate, / So firmly Proof to all the Shocks of Fate?

Not overly ornate or showy.

Sometimes she passed down avenues of sedate mansions, soberly numbered ‘one’, ‘two’, ‘three’, and so on right up to two or three hundred, each the copy of the other, with two pillars and six steps and a pair of curtains neatly drawn […]

The shiny carriages of Yankee officers’ wives and newly rich Carpetbaggers splashed mud on the dilapidated buggies of the townspeople, and gaudy new homes of wealthy strangers crowded in among the sedate dwellings of older citizens.

To calm or put (a person) to sleep using a sedative drug.

Though he may have been sedated, he knew I was there, knew who I was, knew I was talking to him.

To make tranquil.