• easy style, felicity in writing
• with great ease of manners
• airily, easily, hand over fist, hand over hand, hands down, in an easy manner, jauntily, light, lightly, readily, wispily, with ease, with great ease of manners
• ease, facility, fluency, jauntiness, lightness, readiness
• to take to sg like a duck to water
• to take sg in one's stride