humorous

to be very calm and relaxed, especially in a difficult situation.

I expected him to be all nervous before his interview but he was as cool as a cucumber.

• in good hands
• in good time
• in hand
• in harness
• in heart of hearts
• in heaven's name
• in her infinite wisdom
• in her wisdom
• in high dudgeon
• in high gear
• in his infinite wisdom
• in his wisdom
• in hock
• in hopes of
• in hopes of doing something
• in hot pursuit
• in hot pursuit of
• in hot pursuit of someone
• in hot pursuit of something
• in hot water
• in hour of need
• in infinite wisdom
• in inverted commas
• in its infinite wisdom
• in its prime