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Webster 1913 Edition

Adj.

Free from agitation; calm; sedate; quiet; tranquil; self-possessed.

–

Com-pos′ed-ly

adv.

–

Com-pos′ed-ness

Noun.

pp.

Set together, or in due order; formed; constituted; calmed; quieted; settled; adjusted.

a. Calm; sedate; quiet; tranquil; free from agitation.

The Mantuan there is sober triumph sat,

Composed his posture, and his look sedate.

composed ‎(comparative more composed, superlative most composed)

showing composure.
- 2011 June 4, Phil McNulty, “England 2 - 2 Switzerland”, in BBC:
  Milner and Theo Walcott failed to justify their selection ahead of Aston Villa's Young as they struggled ineffectually in the first half, leaving striker Bent isolated and starved of supply as Switzerland looked the more composed and ordered team.

showing composure

composed