Definition from Wiktionary, the free dictionary
ice-calm (not comparable)
- (idiomatic) Extreme calm, utter calmness
2012 June 28, Jamie Jackson, “Wimbledon 2012: Lukas Rosol shocked by miracle win over Rafael Nadal”, the Guardian:
- There was no distracting Rosol's ice-calm as he killed the fifth set and match. Ace, cross-court forehand winner, ace, forehand winner – a blistering eighth game took him to 5-3 and informed Nadal precisely how nerveless the Czech was.