Sedate

Definitions: (1) keeping a quiet and steady attitude or pace; calm; undisturbed; tranquil; (2) possessing a composed and decorous seriousness; sober; dignified; (3) serene; contemplative

Too Far: laziness, procrastination

Poetry:
If you would grow great and stately
You must try to walk sedately.
— Robert Louis Stevenson (1850-1894) Scottish poet

Quote:
The mind is so rarely disturbed, but that the company of friend will restore it to some degree of tranquility and sedateness. — Adam Smith (1723–1790) Scottish economist & philosopher