sedate

Concise Oxford English Dictionary © 2008 Oxford University Press:
sedate1

▶adjective

• 1 calm and unhurried.

• 2 staid and rather dull.

– derivatives
sedately adverb,
sedateness noun.

– origin ME (also as a medical term in the sense ‘not sore or painful’): from L. sedatus, sedare ‘settle’, from sedere ‘sit’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
sedate2

▶verb put under sedation.

– origin 1960s: back-form. from sedation.