cool-headed

cool-headed (comparative more cool-headed, superlative most cool-headed)

1. Calm and imperturbable, especially under pressure.

   Synonyms: even-keeled, even-tempered, level-headed; see also Thesaurus:calm

   • 2014 September 23, A teacher, “Choosing a primary school: a teacher's guide for parents”, in The Guardian:

     The best headteachers are like submarine captains – cool-headed, astute decision-makers – who trust their colleagues and surroundings to indicate where their ship is headed.

• cool-headedness

• cool head
• cool heads will prevail